docker-mailserver/docs/content/config/user-management/aliases.md
polarathene 021e942c4c docs(refactor): Large refactor + additions + fixes
Consistency pass, formatting cleanup and fixes, introduce admonitions, add front-matter.

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docs: Add front-matter

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docs: Fix and format links

- Some links were invalid (eg files moved or renamed)
- Some were valid but had invalid section headers (content removed or migrated)
- Some use `http://` instead of `https://` when the website supports a secure connection.
- Some already used the `[name][reference]` convention but often with a number that wasn't as useful for maintenance.
- All referenced docs needed URLs replaced. Opted for the `[name][reference]` approach to group them all clearly at the bottom of the doc, especially with the relative URLs and in some cases many duplicate entries.
- All `tomav` references from the original repo prior to switch to an organization have been corrected.
- Minor cosmetic changes to the `name` part of the URL, such as for referencing issues to be consistent.
- Some small changes to text body, usually due to duplicate URL reference that was unnecessary (open relay, youtous)
- Switched other links to use the `[name][reference]` format when there was a large group of URLs such as wikipedia or kubernetes. Github repos that reference projects related to `docker-mailserver` also got placed here so they're noticed better by maintainers. This also helped quite a bit with `mermaid` external links that are very long.
- There was a Github Wiki supported syntax in use `[[name | link]]` for `fetchmail` page that isn't compatible by default with MkDocs (needs a plugin), converted to `[name][reference]` instead since it's a relative link.

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docs: Update commit link for LDAP override script

Logic moved to another file, keeping the permalink commit reference so it's unaffected by any changes in the file referenced in future.

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docs: Heading corrections

Consistency pass. Helps with the Table of Contents (top-right UI) aka Document Outline.
docs: codefence cleanup

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docs: misc cleanup

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docs: Add Admonitions

Switches `<details>` usage for collapsible admonitions (`???`) while other text content is switched to the visually more distinct admoniton (`!!!` or `???+`) style.

This does affect editor syntax highlighting a bit and markdown linting as it's custom non-standard markdown syntax.
2021-03-25 11:49:24 +13:00

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title
User Management | Aliases

Please read the Postfix documentation on virtual aliases first.

You can use setup.sh instead of creating and editing files manually. Aliases are managed in /tmp/docker-mailserver/postfix-virtual.cf. An alias is a full email address that will either be:

  • delivered to an existing account registered in /tmp/docker-mailserver/postfix-accounts.cf
  • redirected to one or more other email addresses

Alias and target are space separated. An example on a server with domain.tld as its domain:

# Alias delivered to an existing account
alias1@domain.tld user1@domain.tld

# Alias forwarded to an external email address
alias2@domain.tld external@gmail.com

Configuring RegExp Aliases

Additional regexp aliases can be configured by placing them into config/postfix-regexp.cf. The regexp aliases get evaluated after the virtual aliases (/tmp/docker-mailserver/postfix-virtual.cf). For example, the following config/postfix-regexp.cf causes all email to "test" users to be delivered to qa@example.com:

/^test[0-9][0-9]*@example.com/ qa@example.com

Address Tags (Extension Delimiters) an Alternative to Aliases

Postfix supports so-called address tags, in the form of plus (+) tags - i.e. address+tag@example.com will end up at address@example.com. This is configured by default and the (configurable !) separator is set to +. For more info, see How to use Address Tagging (user+tag@example.com) with Postfix and the official documentation.

!!! note If you do decide to change the configurable separator, you must add the same line to both config/postfix-main.cf and config/dovecot.cf, because Dovecot is acting as the delivery agent. For example, to switch to -, add:

recipient_delimiter = -