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# Reply by email
GitLab can be set up to allow users to comment on issues and merge requests by replying to notification emails.
## 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, Google Apps, Yahoo! Mail, Outlook.com and iCloud, as well as the Postfix mail server which you can run on-premises.
If you want to use Gmail / Google Apps with Reply by email, make sure you have [IMAP access enabled](https://support.google.com/mail/troubleshooter/1668960?hl=en#ts=1665018) and [allow less secure apps to access the account](https://support.google.com/accounts/answer/6010255).
To set up a basic Postfix mail server with IMAP access on Ubuntu, follow [these instructions](./postfix.md).
## Set it up
### Omnibus package installations
1. Find the `incoming_email` section in `/etc/gitlab/gitlab.rb`, enable the feature and fill in the details for your specific IMAP server and email account:
```ruby
# Configuration for Postfix mail server, assumes mailbox incoming@gitlab.example.com
gitlab_rails['incoming_email_enabled'] = true
# The email address including a placeholder for the key that references the item being replied to.
# The `%{key}` placeholder is added after the user part, before the `@`.
gitlab_rails['incoming_email_address'] = "incoming+%{key}@gitlab.example.com"
# Email account username
# With third party providers, this is usually the full email address.
# With self-hosted email servers, this is usually the user part of the email address.
gitlab_rails['incoming_email_email'] = "incoming"
# Email account password
gitlab_rails['incoming_email_password'] = "[REDACTED]"
# IMAP server host
gitlab_rails['incoming_email_host'] = "gitlab.example.com"
# IMAP server port
gitlab_rails['incoming_email_port'] = 143
# Whether the IMAP server uses SSL
gitlab_rails['incoming_email_ssl'] = false
# Whether the IMAP server uses StartTLS
gitlab_rails['incoming_email_start_tls'] = false
# The mailbox where incoming mail will end up. Usually "inbox".
gitlab_rails['incoming_email_mailbox_name'] = "inbox"
```
```ruby
# Configuration for Gmail / Google Apps, assumes mailbox gitlab-incoming@gmail.com
gitlab_rails['incoming_email_enabled'] = true
# The email address including the `%{key}` placeholder that will be replaced to reference the item being replied to.
# The `%{key}` placeholder is added after the user part, after a `+` character, before the `@`.
gitlab_rails['incoming_email_address'] = "gitlab-incoming+%{key}@gmail.com"
# Email account username
# With third party providers, this is usually the full email address.
# With self-hosted email servers, this is usually the user part of the email address.
gitlab_rails['incoming_email_email'] = "gitlab-incoming@gmail.com"
# Email account password
gitlab_rails['incoming_email_password'] = "[REDACTED]"
# IMAP server host
gitlab_rails['incoming_email_host'] = "imap.gmail.com"
# IMAP server port
gitlab_rails['incoming_email_port'] = 993
# Whether the IMAP server uses SSL
gitlab_rails['incoming_email_ssl'] = true
# Whether the IMAP server uses StartTLS
gitlab_rails['incoming_email_start_tls'] = false
# The mailbox where incoming mail will end up. Usually "inbox".
gitlab_rails['incoming_email_mailbox_name'] = "inbox"
```
As mentioned, the part after `+` in the address is ignored, and any email sent here will end up in the mailbox for `incoming@gitlab.example.com`/`gitlab-incoming@gmail.com`.
1. Reconfigure GitLab and restart mailroom for the changes to take effect:
```sh
sudo gitlab-ctl reconfigure
sudo gitlab-ctl restart mailroom
```
1. Verify that everything is configured correctly:
```sh
sudo gitlab-rake gitlab:incoming_email:check
```
1. Reply by email should now be working.
### Installations from source
1. Go to the GitLab installation directory:
```sh
cd /home/git/gitlab
```
1. Find the `incoming_email` section in `config/gitlab.yml`, enable the feature and fill in the details for your specific IMAP server and email account:
```sh
sudo editor config/gitlab.yml
```
```yaml
# Configuration for Postfix mail server, assumes mailbox incoming@gitlab.example.com
incoming_email:
enabled: true
# The email address including the `%{key}` placeholder that will be replaced to reference the item being replied to.
# The `%{key}` placeholder is added after the user part, after a `+` character, before the `@`.
address: "incoming+%{key}@gitlab.example.com"
# Email account username
# With third party providers, this is usually the full email address.
# With self-hosted email servers, this is usually the user part of the email address.
user: "incoming"
# Email account password
password: "[REDACTED]"
# IMAP server host
host: "gitlab.example.com"
# IMAP server port
port: 143
# Whether the IMAP server uses SSL
ssl: false
# Whether the IMAP server uses StartTLS
start_tls: false
# The mailbox where incoming mail will end up. Usually "inbox".
mailbox: "inbox"
```
```yaml
# Configuration for Gmail / Google Apps, assumes mailbox gitlab-incoming@gmail.com
incoming_email:
enabled: true
# The email address including the `%{key}` placeholder that will be replaced to reference the item being replied to.
# The `%{key}` placeholder is added after the user part, after a `+` character, before the `@`.
address: "gitlab-incoming+%{key}@gmail.com"
# Email account username
# With third party providers, this is usually the full email address.
# With self-hosted email servers, this is usually the user part of the email address.
user: "gitlab-incoming@gmail.com"
# Email account password
password: "[REDACTED]"
# IMAP server host
host: "imap.gmail.com"
# IMAP server port
port: 993
# Whether the IMAP server uses SSL
ssl: true
# Whether the IMAP server uses StartTLS
start_tls: false
# The mailbox where incoming mail will end up. Usually "inbox".
mailbox: "inbox"
```
As mentioned, the part after `+` in the address is ignored, and any email sent here will end up in the mailbox for `incoming@gitlab.example.com`/`gitlab-incoming@gmail.com`.
1. Enable `mail_room` in the init script at `/etc/default/gitlab`:
```sh
sudo mkdir -p /etc/default
echo 'mail_room_enabled=true' | sudo tee -a /etc/default/gitlab
```
1. Restart GitLab:
```sh
sudo service gitlab restart
```
1. Verify that everything is configured correctly:
```sh
sudo -u git -H bundle exec rake gitlab:incoming_email:check RAILS_ENV=production
```
1. Reply by email should now be working.
### Development
1. Go to the GitLab installation directory.
1. Find the `incoming_email` section in `config/gitlab.yml`, enable the feature and fill in the details for your specific IMAP server and email account:
```yaml
# Configuration for Gmail / Google Apps, assumes mailbox gitlab-incoming@gmail.com
incoming_email:
enabled: true
# The email address including a placeholder for the key that references the item being replied to.
# The `%{key}` placeholder is added after the user part, before the `@`.
address: "gitlab-incoming+%{key}@gmail.com"
# Email account username
# With third party providers, this is usually the full email address.
# With self-hosted email servers, this is usually the user part of the email address.
user: "gitlab-incoming@gmail.com"
# Email account password
password: "[REDACTED]"
# IMAP server host
host: "imap.gmail.com"
# IMAP server port
port: 993
# Whether the IMAP server uses SSL
ssl: true
# Whether the IMAP server uses StartTLS
start_tls: false
# The mailbox where incoming mail will end up. Usually "inbox".
mailbox: "inbox"
```
As mentioned, the part after `+` is ignored, and this will end up in the mailbox for `gitlab-incoming@gmail.com`.
1. Uncomment the `mail_room` line in your `Procfile`:
```yaml
mail_room: bundle exec mail_room -q -c config/mail_room.yml
```
1. Restart GitLab:
```sh
bundle exec foreman start
```
1. Verify that everything is configured correctly:
```sh
bundle exec rake gitlab:incoming_email:check RAILS_ENV=development
```
1. Reply by email should now be working.
|
