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73 lines
4.4 KiB
Markdown
73 lines
4.4 KiB
Markdown
---
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title: 'Use Cases | Customize Mailbox Folders'
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hide:
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- toc # Hide Table of Contents for this page
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---
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# Mailboxes (_aka IMAP Folders_)
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`INBOX` is setup as the private [`inbox` namespace][dovecot-docs-namespaces]. By default [`target/dovecot/15-mailboxes.conf`][gh-config-dovecot-mailboxes] configures the special IMAP folders `Drafts`, `Sent`, `Junk` and `Trash` to be automatically created and subscribed. They are all assigned to the private [`inbox` namespace][dovecot-docs-namespaces] (_which implicitly provides the `INBOX` folder_).
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These IMAP folders are considered special because they add a [_"SPECIAL-USE"_ attribute][rfc-6154], which is a standardized way to communicate to mail clients that the folder serves a purpose like storing spam/junk mail (`\Junk`) or deleted mail (`\Trash`). This differentiates them from regular mail folders that you may use for organizing.
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## Adding a mailbox folder
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See [`target/dovecot/15-mailboxes.conf`][gh-config-dovecot-mailboxes] for existing mailbox folders which you can modify or uncomment to enable some other common mailboxes. For more information try the [official Dovecot documentation][dovecot-docs-mailboxes].
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The `Archive` special IMAP folder may be useful to enable. To do so, make a copy of [`target/dovecot/15-mailboxes.conf`][gh-config-dovecot-mailboxes] and uncomment the `Archive` mailbox definition. Mail clients should understand that this folder is intended for archiving mail due to the [`\Archive` _"SPECIAL-USE"_ attribute][rfc-6154].
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With the provided [docker-compose.yml][gh-config-dockercompose] example, a volume bind mounts the host directory `docker-data/dms/config/` to the container location `/tmp/docker-mailserver/`. Config file overrides should instead be mounted to a different location as described in [Overriding Configuration for Dovecot][docs-config-overrides-dovecot]:
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```yaml
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volumes:
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- ./docker-data/dms/config/dovecot/15-mailboxes.conf:/etc/dovecot/conf.d/15-mailboxes.conf:ro
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```
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## Caution
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### Adding folders to an existing setup
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Handling of newly added mailbox folders can be inconsistent across mail clients:
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- Users may experience issues such as archived emails only being available locally.
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- Users may need to migrate emails manually between two folders.
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### Support for `SPECIAL-USE` attributes
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Not all mail clients support the `SPECIAL-USE` attribute for mailboxes (_defined in [RFC 6154][rfc-6154]_). These clients will treat the mailbox folder as any other, using the name assigned to it instead.
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Some clients may still know to treat these folders for their intended purpose if the mailbox name matches the common names that the `SPECIAL-USE` attributes represent (_eg `Sent` as the mailbox name for `\Sent`_).
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### Internationalization (i18n)
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Usually the mail client will know via context such as the `SPECIAL-USE` attribute or common English mailbox names, to provide a localized label for the users preferred language.
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Take care to test localized names work well as well.
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### Email Clients Support
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- If a new mail account is added without the `SPECIAL-USE` attribute enabled for archives:
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- **Thunderbird** suggests and may create an `Archives` folder on the server.
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- **Outlook for Android** archives to a local folder.
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- **Spark for Android** archives to server folder named `Archive`.
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- If a new mail account is added after the `SPECIAL-USE` attribute is enabled for archives:
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- **Thunderbird**, **Outlook for Android** and **Spark for Android** will use the mailbox folder name assigned.
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!!! caution "Windows Mail"
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**Windows Mail** has been said to ignore `SPECIAL-USE` attribute and look only at the mailbox folder name assigned.
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!!! note "Needs citation"
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This information is provided by the community.
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It presently lacks references to confirm the behaviour. If any information is incorrect please let us know! :smile:
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[docs-config-overrides-dovecot]: ../../config/advanced/override-defaults/dovecot.md#override-configuration
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[gh-config-dockercompose]: https://github.com/docker-mailserver/docker-mailserver/blob/master/docker-compose.yml
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[gh-config-dovecot-mailboxes]: https://github.com/docker-mailserver/docker-mailserver/blob/master/target/dovecot/15-mailboxes.conf
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[dovecot-docs-namespaces]: https://doc.dovecot.org/configuration_manual/namespace/#namespace-inbox
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[dovecot-docs-mailboxes]: https://doc.dovecot.org/configuration_manual/namespace/#mailbox-settings
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[rfc-6154]: https://datatracker.ietf.org/doc/html/rfc6154
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