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# Dealing with email in development
## Sent emails
To view rendered emails "sent" in your development instance, visit
[`/rails/letter_opener`](http://localhost:3000/rails/letter_opener).
Please note that [S/MIME signed](../administration/smime_signing_email.md) emails
[cannot be currently previewed](https://github.com/fgrehm/letter_opener_web/issues/96) with
`letter_opener`.
## Mailer previews
Rails provides a way to preview our mailer templates in HTML and plaintext using
dummy data.
The previews live in [`app/mailers/previews`][previews] and can be viewed at
[`/rails/mailers`](http://localhost:3000/rails/mailers).
See the [Rails guides](https://guides.rubyonrails.org/action_mailer_basics.html#previewing-emails) for more info.
[previews]: https://gitlab.com/gitlab-org/gitlab-foss/tree/master/app/mailers/previews
## Incoming email
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:
Configuration for Gmail / Google Apps, assumes mailbox `gitlab-incoming@gmail.com`:
```yaml
incoming_email:
enabled: true
# The email address including the `%{key}` placeholder that will be replaced to reference the item being replied to.
# The placeholder can be omitted but if present, it must appear in the "user" part of the address (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"
# The IDLE command timeout.
idle_timeout: 60
```
As mentioned, the part after `+` is ignored, and this will end up in the mailbox for `gitlab-incoming@gmail.com`.
1. Run this command in the GitLab root directory to launch `mail_room`:
```shell
bundle exec mail_room -q -c config/mail_room.yml
```
1. Verify that everything is configured correctly:
```shell
bundle exec rake gitlab:incoming_email:check RAILS_ENV=development
```
1. Reply by email should now be working.
## Email namespace
As of GitLab 11.7, we support a new format for email handler addresses. This was done to
support catch-all mailboxes.
If you need to implement a feature which requires a new email handler, follow these rules
for the format of the email key:
- Actions are always at the end, separated by `-`. For example `-issue` or `-merge-request`
- If your feature is related to a project, the key begins with the project identifiers (project path slug
and project id), separated by `-`. For example, `gitlab-org-gitlab-foss-20`
- Additional information, such as an author's token, can be added between the project identifiers and
the action, separated by `-`. For example, `gitlab-org-gitlab-foss-20-Author_Token12345678-issue`
- You register your handlers in `lib/gitlab/email/handler.rb`
Examples of valid email keys:
- `gitlab-org-gitlab-foss-20-Author_Token12345678-issue` (create a new issue)
- `gitlab-org-gitlab-foss-20-Author_Token12345678-merge-request` (create a new merge request)
- `1234567890abcdef1234567890abcdef-unsubscribe` (unsubscribe from a conversation)
- `1234567890abcdef1234567890abcdef` (reply to a conversation)
Please note that the action `-issue-` is used in GitLab Premium as the handler for the Service Desk feature.
### Legacy format
Although we continue to support the older legacy format, no new features should use a legacy format.
These are the only valid legacy formats for an email handler:
- `path/to/project+namespace`
- `path/to/project+namespace+action`
- `namespace`
- `namespace+action`
Please note that `path/to/project` is used in GitLab Premium as handler for the Service Desk feature.
---
[Return to Development documentation](README.md)
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