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Please first read Postfix documentation on virtual aliases.
Configuring aliases
Aliases are managed in /tmp/docker-mailserver/postfix-aliases.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.
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-aliases.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) as 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 that 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 = -