diff --git a/src/postorius/tests/fixtures/vcr_cassettes/TestSubscription.test_subscribe_mod_then_open.yaml b/src/postorius/tests/fixtures/vcr_cassettes/TestSubscription.test_subscribe_mod_then_open.yaml
new file mode 100644
index 0000000..b74eadf
--- /dev/null
+++ b/src/postorius/tests/fixtures/vcr_cassettes/TestSubscription.test_subscribe_mod_then_open.yaml
@@ -0,0 +1,735 @@
+interactions:
+- request:
+    body: mail_host=example.com
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode POST
+    uri: http://localhost:9001/3.0/domains
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+      location: ['http://localhost:9001/3.0/domains/example.com']
+    status: {code: 201, message: Created}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/domains/example.com
+  response:
+    body: {string: !!python/unicode '{"base_url": "http://example.com", "description":
+        null, "http_etag": "\"e736411818ff1815ca83575e0958c38c5188f0a4\"", "mail_host":
+        "example.com", "self_link": "http://localhost:9001/3.0/domains/example.com",
+        "url_host": "example.com"}'}
+    headers:
+      content-length: ['233']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: fqdn_listname=open_list%40example.com
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode POST
+    uri: http://localhost:9001/3.0/lists
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+      location: ['http://localhost:9001/3.0/lists/open_list.example.com']
+    status: {code: 201, message: Created}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/open_list.example.com
+  response:
+    body: {string: !!python/unicode '{"display_name": "Open_list", "fqdn_listname":
+        "open_list@example.com", "http_etag": "\"6726e101e1dd1de6043eee72f741d4c2479f4735\"",
+        "list_id": "open_list.example.com", "list_name": "open_list", "mail_host":
+        "example.com", "member_count": 0, "self_link": "http://localhost:9001/3.0/lists/open_list.example.com",
+        "volume": 1}'}
+    headers:
+      content-length: ['324']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/open_list@example.com/config
+  response:
+    body: {string: !!python/unicode '{"acceptable_aliases": [], "admin_immed_notify":
+        true, "admin_notify_mchanges": false, "administrivia": true, "advertised":
+        true, "allow_list_posts": true, "anonymous_list": false, "archive_policy":
+        "public", "autorespond_owner": "none", "autorespond_postings": "none", "autorespond_requests":
+        "none", "autoresponse_grace_period": "90d", "autoresponse_owner_text": "",
+        "autoresponse_postings_text": "", "autoresponse_request_text": "", "bounces_address":
+        "open_list-bounces@example.com", "collapse_alternatives": true, "convert_html_to_plaintext":
+        false, "created_at": "2005-08-01T07:49:23", "default_member_action": "defer",
+        "default_nonmember_action": "hold", "description": "", "digest_last_sent_at":
+        null, "digest_send_periodic": true, "digest_size_threshold": 30.0, "digest_volume_frequency":
+        "monthly", "digests_enabled": true, "display_name": "Open_list", "filter_content":
+        false, "first_strip_reply_to": false, "fqdn_listname": "open_list@example.com",
+        "http_etag": "\"0df09b8caf490c5b0108208cf1a653105fcc6893\"", "include_rfc2369_headers":
+        true, "join_address": "open_list-join@example.com", "last_post_at": null,
+        "leave_address": "open_list-leave@example.com", "list_name": "open_list",
+        "mail_host": "example.com", "next_digest_number": 1, "no_reply_address": "noreply@example.com",
+        "owner_address": "open_list-owner@example.com", "post_id": 1, "posting_address":
+        "open_list@example.com", "posting_pipeline": "default-posting-pipeline", "reply_goes_to_list":
+        "no_munging", "reply_to_address": "", "request_address": "open_list-request@example.com",
+        "scheme": "http", "send_welcome_message": true, "subject_prefix": "[Open_list]
+        ", "subscription_policy": "confirm", "volume": 1, "web_host": "example.com",
+        "welcome_message_uri": "mailman:///welcome.txt"}'}
+    headers:
+      content-length: ['1763']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: subscription_policy=open
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode PATCH
+    uri: http://localhost:9001/3.0/lists/open_list@example.com/config
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+    status: {code: 204, message: No Content}
+- request:
+    body: fqdn_listname=moderate_subs%40example.com
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode POST
+    uri: http://localhost:9001/3.0/lists
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+      location: ['http://localhost:9001/3.0/lists/moderate_subs.example.com']
+    status: {code: 201, message: Created}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com
+  response:
+    body: {string: !!python/unicode '{"display_name": "Moderate_subs", "fqdn_listname":
+        "moderate_subs@example.com", "http_etag": "\"4cf5a031a451ad84a54e4c708cacda8e676e617f\"",
+        "list_id": "moderate_subs.example.com", "list_name": "moderate_subs", "mail_host":
+        "example.com", "member_count": 0, "self_link": "http://localhost:9001/3.0/lists/moderate_subs.example.com",
+        "volume": 1}'}
+    headers:
+      content-length: ['344']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs@example.com/config
+  response:
+    body: {string: !!python/unicode '{"acceptable_aliases": [], "admin_immed_notify":
+        true, "admin_notify_mchanges": false, "administrivia": true, "advertised":
+        true, "allow_list_posts": true, "anonymous_list": false, "archive_policy":
+        "public", "autorespond_owner": "none", "autorespond_postings": "none", "autorespond_requests":
+        "none", "autoresponse_grace_period": "90d", "autoresponse_owner_text": "",
+        "autoresponse_postings_text": "", "autoresponse_request_text": "", "bounces_address":
+        "moderate_subs-bounces@example.com", "collapse_alternatives": true, "convert_html_to_plaintext":
+        false, "created_at": "2005-08-01T07:49:23", "default_member_action": "defer",
+        "default_nonmember_action": "hold", "description": "", "digest_last_sent_at":
+        null, "digest_send_periodic": true, "digest_size_threshold": 30.0, "digest_volume_frequency":
+        "monthly", "digests_enabled": true, "display_name": "Moderate_subs", "filter_content":
+        false, "first_strip_reply_to": false, "fqdn_listname": "moderate_subs@example.com",
+        "http_etag": "\"0ef83c8b84b16db2b497557f2d5cbba080ff1f77\"", "include_rfc2369_headers":
+        true, "join_address": "moderate_subs-join@example.com", "last_post_at": null,
+        "leave_address": "moderate_subs-leave@example.com", "list_name": "moderate_subs",
+        "mail_host": "example.com", "next_digest_number": 1, "no_reply_address": "noreply@example.com",
+        "owner_address": "moderate_subs-owner@example.com", "post_id": 1, "posting_address":
+        "moderate_subs@example.com", "posting_pipeline": "default-posting-pipeline",
+        "reply_goes_to_list": "no_munging", "reply_to_address": "", "request_address":
+        "moderate_subs-request@example.com", "scheme": "http", "send_welcome_message":
+        true, "subject_prefix": "[Moderate_subs] ", "subscription_policy": "confirm",
+        "volume": 1, "web_host": "example.com", "welcome_message_uri": "mailman:///welcome.txt"}'}
+    headers:
+      content-length: ['1803']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: subscription_policy=moderate
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode PATCH
+    uri: http://localhost:9001/3.0/lists/moderate_subs@example.com/config
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+    status: {code: 204, message: No Content}
+- request:
+    body: email=test%40example.com
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode POST
+    uri: http://localhost:9001/3.0/users
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+      location: ['http://localhost:9001/3.0/users/1']
+    status: {code: 201, message: Created}
+- request:
+    body: email=fritz%40example.org
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode POST
+    uri: http://localhost:9001/3.0/users/1/addresses
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+      location: ['http://localhost:9001/3.0/addresses/fritz@example.org']
+    status: {code: 201, message: Created}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode POST
+    uri: http://localhost:9001/3.0/addresses/fritz@example.org/verify
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+    status: {code: 204, message: No Content}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com
+  response:
+    body: {string: !!python/unicode '{"display_name": "Moderate_subs", "fqdn_listname":
+        "moderate_subs@example.com", "http_etag": "\"4cf5a031a451ad84a54e4c708cacda8e676e617f\"",
+        "list_id": "moderate_subs.example.com", "list_name": "moderate_subs", "mail_host":
+        "example.com", "member_count": 0, "self_link": "http://localhost:9001/3.0/lists/moderate_subs.example.com",
+        "volume": 1}'}
+    headers:
+      content-length: ['344']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/users/test@example.com
+  response:
+    body: {string: !!python/unicode '{"created_on": "2005-08-01T07:49:23", "http_etag":
+        "\"d000604df7fcf30f09fb110b78bb199a2f4354a3\"", "is_server_owner": false,
+        "password": "$6$rounds=659686$FJfzJ0zbBHLK53.o$7pD4Z9ueX8OmPOpIHMsZ52rLufxDxzHcF5w8v7DYEuSI5ibQ3sHEVXsU4upeGbMZAHiElHwIIyulDm24m9vgV/",
+        "self_link": "http://localhost:9001/3.0/users/1", "user_id": 1}'}
+    headers:
+      content-length: ['324']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/users/1/addresses
+  response:
+    body: {string: !!python/unicode '{"entries": [{"email": "fritz@example.org", "http_etag":
+        "\"beba50816195251c83f486bbd257e29fd639385f\"", "original_email": "fritz@example.org",
+        "registered_on": "2005-08-01T07:49:23", "self_link": "http://localhost:9001/3.0/addresses/fritz@example.org",
+        "user": "http://localhost:9001/3.0/users/1", "verified_on": "2005-08-01T07:49:23"},
+        {"email": "test@example.com", "http_etag": "\"0e805a389459bccaa6e81517808582547119e624\"",
+        "original_email": "test@example.com", "registered_on": "2005-08-01T07:49:23",
+        "self_link": "http://localhost:9001/3.0/addresses/test@example.com", "user":
+        "http://localhost:9001/3.0/users/1"}], "http_etag": "\"ee559713b362b6255ec837d55998b5008bee5f45\"",
+        "start": 0, "total_size": 2}'}
+    headers:
+      content-length: ['712']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com/roster/owner
+  response:
+    body: {string: !!python/unicode '{"http_etag": "\"32223434a0f3af4cdc4673d1fbc5bac1f6d98fd3\"",
+        "start": 0, "total_size": 0}'}
+    headers:
+      content-length: ['90']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com/roster/moderator
+  response:
+    body: {string: !!python/unicode '{"http_etag": "\"32223434a0f3af4cdc4673d1fbc5bac1f6d98fd3\"",
+        "start": 0, "total_size": 0}'}
+    headers:
+      content-length: ['90']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: display_name=None&list_id=moderate_subs.example.com&pre_confirmed=True&pre_verified=True&subscriber=test%40example.com
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode POST
+    uri: http://localhost:9001/3.0/members
+  response:
+    body: {string: !!python/unicode '{"http_etag": "\"8171955e8578477ccef9f84470dd4b8e2ebb3615\"",
+        "token": "0000000000000000000000000000000000000001", "token_owner": "moderator"}'}
+    headers:
+      content-length: ['142']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 202, message: Accepted}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs@example.com/roster/member
+  response:
+    body: {string: !!python/unicode '{"http_etag": "\"32223434a0f3af4cdc4673d1fbc5bac1f6d98fd3\"",
+        "start": 0, "total_size": 0}'}
+    headers:
+      content-length: ['90']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs@example.com/requests
+  response:
+    body: {string: !!python/unicode '{"entries": [{"display_name": "", "email": "test@example.com",
+        "http_etag": "\"8efa5e1807fb677a182a8fad178f764070f16556\"", "list_id": "moderate_subs.example.com",
+        "token": "0000000000000000000000000000000000000001", "token_owner": "moderator",
+        "type": "subscription", "when": "2005-08-01T07:49:23"}], "http_etag": "\"389657a991521e274eeead2cd3166d897f1cb4cf\"",
+        "start": 0, "total_size": 1}'}
+    headers:
+      content-length: ['391']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs@example.com/config
+  response:
+    body: {string: !!python/unicode '{"acceptable_aliases": [], "admin_immed_notify":
+        true, "admin_notify_mchanges": false, "administrivia": true, "advertised":
+        true, "allow_list_posts": true, "anonymous_list": false, "archive_policy":
+        "public", "autorespond_owner": "none", "autorespond_postings": "none", "autorespond_requests":
+        "none", "autoresponse_grace_period": "90d", "autoresponse_owner_text": "",
+        "autoresponse_postings_text": "", "autoresponse_request_text": "", "bounces_address":
+        "moderate_subs-bounces@example.com", "collapse_alternatives": true, "convert_html_to_plaintext":
+        false, "created_at": "2005-08-01T07:49:23", "default_member_action": "defer",
+        "default_nonmember_action": "hold", "description": "", "digest_last_sent_at":
+        null, "digest_send_periodic": true, "digest_size_threshold": 30.0, "digest_volume_frequency":
+        "monthly", "digests_enabled": true, "display_name": "Moderate_subs", "filter_content":
+        false, "first_strip_reply_to": false, "fqdn_listname": "moderate_subs@example.com",
+        "http_etag": "\"d3e0584c03eeb46b4dbfe4412a8d63477a9c3d3c\"", "include_rfc2369_headers":
+        true, "join_address": "moderate_subs-join@example.com", "last_post_at": null,
+        "leave_address": "moderate_subs-leave@example.com", "list_name": "moderate_subs",
+        "mail_host": "example.com", "next_digest_number": 1, "no_reply_address": "noreply@example.com",
+        "owner_address": "moderate_subs-owner@example.com", "post_id": 1, "posting_address":
+        "moderate_subs@example.com", "posting_pipeline": "default-posting-pipeline",
+        "reply_goes_to_list": "no_munging", "reply_to_address": "", "request_address":
+        "moderate_subs-request@example.com", "scheme": "http", "send_welcome_message":
+        true, "subject_prefix": "[Moderate_subs] ", "subscription_policy": "moderate",
+        "volume": 1, "web_host": "example.com", "welcome_message_uri": "mailman:///welcome.txt"}'}
+    headers:
+      content-length: ['1804']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: subscription_policy=open
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode PATCH
+    uri: http://localhost:9001/3.0/lists/moderate_subs@example.com/config
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+    status: {code: 204, message: No Content}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs@example.com/config
+  response:
+    body: {string: !!python/unicode '{"acceptable_aliases": [], "admin_immed_notify":
+        true, "admin_notify_mchanges": false, "administrivia": true, "advertised":
+        true, "allow_list_posts": true, "anonymous_list": false, "archive_policy":
+        "public", "autorespond_owner": "none", "autorespond_postings": "none", "autorespond_requests":
+        "none", "autoresponse_grace_period": "90d", "autoresponse_owner_text": "",
+        "autoresponse_postings_text": "", "autoresponse_request_text": "", "bounces_address":
+        "moderate_subs-bounces@example.com", "collapse_alternatives": true, "convert_html_to_plaintext":
+        false, "created_at": "2005-08-01T07:49:23", "default_member_action": "defer",
+        "default_nonmember_action": "hold", "description": "", "digest_last_sent_at":
+        null, "digest_send_periodic": true, "digest_size_threshold": 30.0, "digest_volume_frequency":
+        "monthly", "digests_enabled": true, "display_name": "Moderate_subs", "filter_content":
+        false, "first_strip_reply_to": false, "fqdn_listname": "moderate_subs@example.com",
+        "http_etag": "\"d7aa0fd214f12d213401f69434fa4ea4915ca5e6\"", "include_rfc2369_headers":
+        true, "join_address": "moderate_subs-join@example.com", "last_post_at": null,
+        "leave_address": "moderate_subs-leave@example.com", "list_name": "moderate_subs",
+        "mail_host": "example.com", "next_digest_number": 1, "no_reply_address": "noreply@example.com",
+        "owner_address": "moderate_subs-owner@example.com", "post_id": 1, "posting_address":
+        "moderate_subs@example.com", "posting_pipeline": "default-posting-pipeline",
+        "reply_goes_to_list": "no_munging", "reply_to_address": "", "request_address":
+        "moderate_subs-request@example.com", "scheme": "http", "send_welcome_message":
+        true, "subject_prefix": "[Moderate_subs] ", "subscription_policy": "open",
+        "volume": 1, "web_host": "example.com", "welcome_message_uri": "mailman:///welcome.txt"}'}
+    headers:
+      content-length: ['1800']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: display_name=None&list_id=moderate_subs.example.com&subscriber=test%40example.com
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode POST
+    uri: http://localhost:9001/3.0/members
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+      location: ['http://localhost:9001/3.0/members/1']
+    status: {code: 201, message: Created}
+- request:
+    body: list_id=moderate_subs.example.com&role=owner&subscriber=owner%40example.com
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode POST
+    uri: http://localhost:9001/3.0/members
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+      location: ['http://localhost:9001/3.0/members/2']
+    status: {code: 201, message: Created}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs@example.com/requests
+  response:
+    body: {string: !!python/unicode '{"entries": [{"display_name": "", "email": "test@example.com",
+        "http_etag": "\"8efa5e1807fb677a182a8fad178f764070f16556\"", "list_id": "moderate_subs.example.com",
+        "token": "0000000000000000000000000000000000000001", "token_owner": "moderator",
+        "type": "subscription", "when": "2005-08-01T07:49:23"}], "http_etag": "\"389657a991521e274eeead2cd3166d897f1cb4cf\"",
+        "start": 0, "total_size": 1}'}
+    headers:
+      content-length: ['391']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com
+  response:
+    body: {string: !!python/unicode '{"display_name": "Moderate_subs", "fqdn_listname":
+        "moderate_subs@example.com", "http_etag": "\"a6393b93de923071ca7ff53a24659f3af9943b1a\"",
+        "list_id": "moderate_subs.example.com", "list_name": "moderate_subs", "mail_host":
+        "example.com", "member_count": 1, "self_link": "http://localhost:9001/3.0/lists/moderate_subs.example.com",
+        "volume": 1}'}
+    headers:
+      content-length: ['344']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/users/owner@example.com
+  response:
+    body: {string: !!python/unicode '{"created_on": "2005-08-01T07:49:23", "http_etag":
+        "\"b36f8ca1d91d583901c768dc116815282d469c66\"", "is_server_owner": false,
+        "self_link": "http://localhost:9001/3.0/users/2", "user_id": 2}'}
+    headers:
+      content-length: ['188']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/users/2/addresses
+  response:
+    body: {string: !!python/unicode '{"entries": [{"email": "owner@example.com", "http_etag":
+        "\"6d4a96d1a2b0769920049ab9095c2fa1404cf393\"", "original_email": "owner@example.com",
+        "registered_on": "2005-08-01T07:49:23", "self_link": "http://localhost:9001/3.0/addresses/owner@example.com",
+        "user": "http://localhost:9001/3.0/users/2"}], "http_etag": "\"6ea82977c32c28e8aa28a1dc75a795d4ae1c336b\"",
+        "start": 0, "total_size": 1}'}
+    headers:
+      content-length: ['390']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com/roster/owner
+  response:
+    body: {string: !!python/unicode '{"entries": [{"address": "http://localhost:9001/3.0/addresses/owner@example.com",
+        "delivery_mode": "regular", "email": "owner@example.com", "http_etag": "\"c2bb2d9adfc185c7d38c14643224570fe8747fda\"",
+        "list_id": "moderate_subs.example.com", "member_id": 2, "moderation_action":
+        "accept", "role": "owner", "self_link": "http://localhost:9001/3.0/members/2",
+        "user": "http://localhost:9001/3.0/users/2"}], "http_etag": "\"bb5aee1cdfd2fb8488fe4673d767098ebeb900ac\"",
+        "start": 0, "total_size": 1}'}
+    headers:
+      content-length: ['493']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com/roster/moderator
+  response:
+    body: {string: !!python/unicode '{"http_etag": "\"32223434a0f3af4cdc4673d1fbc5bac1f6d98fd3\"",
+        "start": 0, "total_size": 0}'}
+    headers:
+      content-length: ['90']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com
+  response:
+    body: {string: !!python/unicode '{"display_name": "Moderate_subs", "fqdn_listname":
+        "moderate_subs@example.com", "http_etag": "\"a6393b93de923071ca7ff53a24659f3af9943b1a\"",
+        "list_id": "moderate_subs.example.com", "list_name": "moderate_subs", "mail_host":
+        "example.com", "member_count": 1, "self_link": "http://localhost:9001/3.0/lists/moderate_subs.example.com",
+        "volume": 1}'}
+    headers:
+      content-length: ['344']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: action=accept
+    headers:
+      accept-encoding: ['gzip, deflate']
+      !!python/unicode content-type: [!!python/unicode application/x-www-form-urlencoded]
+    method: !!python/unicode POST
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com/requests/0000000000000000000000000000000000000001
+  response:
+    body: {string: !!python/unicode Already subscribed}
+    headers:
+      content-length: ['18']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 409, message: Conflict}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com
+  response:
+    body: {string: !!python/unicode '{"display_name": "Moderate_subs", "fqdn_listname":
+        "moderate_subs@example.com", "http_etag": "\"a6393b93de923071ca7ff53a24659f3af9943b1a\"",
+        "list_id": "moderate_subs.example.com", "list_name": "moderate_subs", "mail_host":
+        "example.com", "member_count": 1, "self_link": "http://localhost:9001/3.0/lists/moderate_subs.example.com",
+        "volume": 1}'}
+    headers:
+      content-length: ['344']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/users/owner@example.com
+  response:
+    body: {string: !!python/unicode '{"created_on": "2005-08-01T07:49:23", "http_etag":
+        "\"b36f8ca1d91d583901c768dc116815282d469c66\"", "is_server_owner": false,
+        "self_link": "http://localhost:9001/3.0/users/2", "user_id": 2}'}
+    headers:
+      content-length: ['188']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/users/2/addresses
+  response:
+    body: {string: !!python/unicode '{"entries": [{"email": "owner@example.com", "http_etag":
+        "\"6d4a96d1a2b0769920049ab9095c2fa1404cf393\"", "original_email": "owner@example.com",
+        "registered_on": "2005-08-01T07:49:23", "self_link": "http://localhost:9001/3.0/addresses/owner@example.com",
+        "user": "http://localhost:9001/3.0/users/2"}], "http_etag": "\"6ea82977c32c28e8aa28a1dc75a795d4ae1c336b\"",
+        "start": 0, "total_size": 1}'}
+    headers:
+      content-length: ['390']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com/roster/owner
+  response:
+    body: {string: !!python/unicode '{"entries": [{"address": "http://localhost:9001/3.0/addresses/owner@example.com",
+        "delivery_mode": "regular", "email": "owner@example.com", "http_etag": "\"c2bb2d9adfc185c7d38c14643224570fe8747fda\"",
+        "list_id": "moderate_subs.example.com", "member_id": 2, "moderation_action":
+        "accept", "role": "owner", "self_link": "http://localhost:9001/3.0/members/2",
+        "user": "http://localhost:9001/3.0/users/2"}], "http_etag": "\"bb5aee1cdfd2fb8488fe4673d767098ebeb900ac\"",
+        "start": 0, "total_size": 1}'}
+    headers:
+      content-length: ['493']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com/roster/moderator
+  response:
+    body: {string: !!python/unicode '{"http_etag": "\"32223434a0f3af4cdc4673d1fbc5bac1f6d98fd3\"",
+        "start": 0, "total_size": 0}'}
+    headers:
+      content-length: ['90']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs.example.com
+  response:
+    body: {string: !!python/unicode '{"display_name": "Moderate_subs", "fqdn_listname":
+        "moderate_subs@example.com", "http_etag": "\"a6393b93de923071ca7ff53a24659f3af9943b1a\"",
+        "list_id": "moderate_subs.example.com", "list_name": "moderate_subs", "mail_host":
+        "example.com", "member_count": 1, "self_link": "http://localhost:9001/3.0/lists/moderate_subs.example.com",
+        "volume": 1}'}
+    headers:
+      content-length: ['344']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs@example.com/requests
+  response:
+    body: {string: !!python/unicode '{"http_etag": "\"32223434a0f3af4cdc4673d1fbc5bac1f6d98fd3\"",
+        "start": 0, "total_size": 0}'}
+    headers:
+      content-length: ['90']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/open_list@example.com/requests
+  response:
+    body: {string: !!python/unicode '{"http_etag": "\"32223434a0f3af4cdc4673d1fbc5bac1f6d98fd3\"",
+        "start": 0, "total_size": 0}'}
+    headers:
+      content-length: ['90']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode GET
+    uri: http://localhost:9001/3.0/lists/moderate_subs@example.com/requests
+  response:
+    body: {string: !!python/unicode '{"http_etag": "\"32223434a0f3af4cdc4673d1fbc5bac1f6d98fd3\"",
+        "start": 0, "total_size": 0}'}
+    headers:
+      content-length: ['90']
+      content-type: [application/json; charset=utf-8]
+    status: {code: 200, message: OK}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode DELETE
+    uri: http://localhost:9001/3.0/lists/open_list@example.com
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+    status: {code: 204, message: No Content}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode DELETE
+    uri: http://localhost:9001/3.0/lists/moderate_subs@example.com
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+    status: {code: 204, message: No Content}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode DELETE
+    uri: http://localhost:9001/3.0/users/1
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+    status: {code: 204, message: No Content}
+- request:
+    body: null
+    headers:
+      accept-encoding: ['gzip, deflate']
+    method: !!python/unicode DELETE
+    uri: http://localhost:9001/3.0/domains/example.com
+  response:
+    body: {string: !!python/unicode ''}
+    headers:
+      content-length: ['0']
+    status: {code: 204, message: No Content}
+version: 1
diff --git a/src/postorius/tests/mailman_api_tests/test_subscriptions.py b/src/postorius/tests/mailman_api_tests/test_subscriptions.py
index 78119a4..b0098bb 100644
--- a/src/postorius/tests/mailman_api_tests/test_subscriptions.py
+++ b/src/postorius/tests/mailman_api_tests/test_subscriptions.py
@@ -120,3 +120,35 @@
         self.assertRedirects(response,
             reverse('list_summary', args=('moderate_subs.example.com', )))
         self.assertHasSuccessMessage(response)
+
+    def test_subscribe_mod_then_open(self):
+        # The list is moderated when the subscription is requested, then the
+        # list is switched to open.
+        self.client.login(username='testuser', password='pwd')
+        response = self.client.post(
+            reverse('list_subscribe', args=('moderate_subs.example.com', )),
+            {'email': 'test@example.com'})
+        self.assertEqual(len(self.mod_list.members), 0)
+        self.assertEqual(len(self.mod_list.requests), 1)
+        self.assertHasSuccessMessage(response)
+        # Switch the list to 'open'
+        self.mod_list.settings['subscription_policy'] = 'open'
+        self.mod_list.settings.save()
+        self.assertEqual(self.mod_list.settings['subscription_policy'], 'open')
+        # Subscribe the user (they are now allowed to self-subscribe)
+        self.mod_list.subscribe('test@example.com')
+        # Login as the owner to accept the subscription
+        owner = User.objects.create_user(
+            'testowner', 'owner@example.com', 'pwd')
+        self.mod_list.add_owner('owner@example.com')
+        self.client.logout()
+        self.client.login(username='testowner', password='pwd')
+        accept_url = reverse(
+            'handle_subscription_request', args=['moderate_subs.example.com',
+            self.mod_list.requests[0]['token'], 'accept'])
+        response = self.client.get(accept_url)
+        self.assertRedirects(
+            response, reverse('list_subscription_requests',
+            args=['moderate_subs.example.com']))
+        message = self.assertHasSuccessMessage(response)
+        self.assertIn('Already subscribed', message)
diff --git a/src/postorius/views/list.py b/src/postorius/views/list.py
index 5c7ff62..8bb777d 100644
--- a/src/postorius/views/list.py
+++ b/src/postorius/views/list.py
@@ -612,7 +612,12 @@
     except MailmanApiError:
         return utils.render_api_error(request)
     except HTTPError as e:
-        messages.error(request, _('The request could not be moderated: %s') % e.reason)
+        if e.code == 409:
+            messages.success(request,
+                _('The request was already moderated: %s') % e.reason)
+        else:
+            messages.error(request,
+                _('The request could not be moderated: %s') % e.reason)
     return redirect('list_subscription_requests', m_list.list_id)