GitLab can be set up to allow users to comment on issues and merge requests by replying to notification emails.
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.
## Get a mailbox
## 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.
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.
