2016-11-03 12:29:30 +05:30
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# Reply by email
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GitLab can be set up to allow users to comment on issues and merge requests by
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replying to notification emails.
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## Requirement
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2018-12-05 23:21:45 +05:30
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Make sure [incoming email](incoming_email.md) is set up.
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2016-11-03 12:29:30 +05:30
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## How it works?
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### 1. GitLab sends a notification email
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When GitLab sends a notification and Reply by email is enabled, the `Reply-To`
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header is set to the address defined in your GitLab configuration, with the
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`%{key}` placeholder (if present) replaced by a specific "reply key". In
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addition, this "reply key" is also added to the `References` header.
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### 2. You reply to the notification email
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When you reply to the notification email, your email client will:
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- send the email to the `Reply-To` address it got from the notification email
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- set the `In-Reply-To` header to the value of the `Message-ID` header from the
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notification email
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- set the `References` header to the value of the `Message-ID` plus the value of
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the notification email's `References` header.
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### 3. GitLab receives your reply to the notification email
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When GitLab receives your reply, it will look for the "reply key" in the
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following headers, in this order:
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1. the `To` header
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1. the `References` header
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If it finds a reply key, it will be able to leave your reply as a comment on
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the entity the notification was about (issue, merge request, commit...).
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For more details about the `Message-ID`, `In-Reply-To`, and `References headers`,
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please consult [RFC 5322](https://tools.ietf.org/html/rfc5322#section-3.6.4).
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