diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5bc9a9639..0e623a43c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -33,6 +33,12 @@ variables:
   MAILBOX_INIT: "zammad@mail.test.dc.zammad.com:zammad"
   MAIL_ADDRESS: "zammad@mail.test.dc.zammad.com"
   MAIL_PASS: "zammad"
+  # docker-imap-devel variables required for integration tests
+  MAIL_SERVER: "mail"
+  MAIL_SERVER_ACCOUNT: "zammad@mail.test.dc.zammad.com:zammad"
+  MAIL_SERVER_EMAIL: "zammad@mail.test.dc.zammad.com"
+  KEEP_ON_MAIL_SERVER: "mail"
+  KEEP_ON_MAIL_SERVER_ACCOUNT: "zammad@mail.test.dc.zammad.com:zammad"
 
 # Cache gems in between jobs and pipelines
 # ATTENTION: We use a combination of the Ruby major and minor version number
diff --git a/.gitlab/ci/base.yml b/.gitlab/ci/base.yml
index 50d1b377e..86c98b6f4 100644
--- a/.gitlab/ci/base.yml
+++ b/.gitlab/ci/base.yml
@@ -86,6 +86,12 @@
     - <<: *docker_postgresql
     - <<: *docker_selenium
 
+.services_mysql_postgresql_imap: &services_mysql_postgresql_imap
+  services:
+    - <<: *docker_mysql
+    - <<: *docker_postgresql
+    - <<: *docker_imap
+
 .services_mysql_postgresql_elasticsearch: &services_mysql_postgresql_elasticsearch
   variables:
     ELASTICSEARCH_TAG: 'stable'
diff --git a/.gitlab/ci/integration/email_helper_deliver.yml b/.gitlab/ci/integration/email_helper_deliver.yml
index 148fd3572..523c944c0 100644
--- a/.gitlab/ci/integration/email_helper_deliver.yml
+++ b/.gitlab/ci/integration/email_helper_deliver.yml
@@ -2,9 +2,10 @@ email_helper_deliver:
   extends:
     - .template_integration
     - .tags_mail
+    - .services_mysql_postgresql_imap
   script:
     - bundle exec rake zammad:db:unseeded
     - bundle exec rails test test/integration/email_helper_test.rb
     - bundle exec rails test test/integration/email_deliver_test.rb
     - bundle exec rails test test/integration/email_keep_on_server_test.rb
-    - bundle exec rails test test/integration/email_postmaster_to_sender.rb
\ No newline at end of file
+    - bundle exec rails test test/integration/email_postmaster_to_sender.rb