Commit 471671f8 authored by Robert Speicher's avatar Robert Speicher

Merge branch 'reply-by-email-known-issue' into 'master'

Document known issue with Reply by email and multiple application servers.

See merge request !1499
parents 94dc0224 4a157e50
......@@ -2,6 +2,10 @@
GitLab can be set up to allow users to comment on issues and merge requests by replying to notification emails.
**Warning**: Do not enable Reply by email if you have **multiple GitLab application servers**.
Due to an issue with the way incoming emails are read from the mail server, every incoming reply-by-email email will result in as many comments being created as you have application servers.
[A fix is being worked on.](https://github.com/tpitale/mail_room/issues/46)
## Get a mailbox
Reply by email requires an IMAP-enabled email account, with a provider or server that supports [email sub-addressing](https://en.wikipedia.org/wiki/Email_address#Sub-addressing). Sub-addressing is a feature where any email to `user+some_arbitrary_tag@example.com` will end up in the mailbox for `user@example.com`, and is supported by providers such as Gmail, Yahoo! Mail, Outlook.com and iCloud, as well as the Postfix mail server which you can run on-premises.
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