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Postfix Documentation
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What domains to receive mail for

The mydestination parameter specifies what domains this machine will deliver locally, instead of forwarding to another machine. The default is to receive mail for the machine itself. See the VIRTUAL_README file for how to configure Postfix for hosted domains.

You can specify zero or more domain names, "/file/name" patterns and/or " type:table" lookup tables (such as hash:, btree:, nis:, ldap:, or mysql:), separated by whitespace and/or commas. A "/file/name" pattern is replaced by its contents; " type:table" requests that a table lookup is done and merely tests for existence: the lookup result is ignored.

IMPORTANT: If your machine is a mail server for its entire domain, you must list $ mydomain as well.

Example 1: default setting.

/etc/postfix/main.cf:
    
mydestination = $
myhostname localhost.$
mydomain localhost

Example 2: domain-wide mail server.

/etc/postfix/main.cf:
    
mydestination = $
myhostname localhost.$
mydomain localhost $
mydomain

Example 3: host with multiple DNS A records.

/etc/postfix/main.cf:
    
mydestination = $
myhostname localhost.$
mydomain localhost 
        www.$
mydomain ftp.$
mydomain

Caution: in order to avoid mail delivery loops, you must list all hostnames of the machine, including $ myhostname, and localhost.$ mydomain.

Postfix Documentation
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