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I have a website on a server with a postfix mail server to send the site's emails. Let's say the domain is example.com.

The site can send mails to mailboxes of his own domain (like contact@example.com), which is hosted on another server and to any other domains.

As I don't want any local delivery, even for example.com, the mydestination parameter is empty.

This worked great, but I can't redirect mails to local users. For example, if mdadm send a mail to root, the mail will be sent to root@example.com directly, without going throw /etc/aliases.

How can I deliver localy mails to local users, and keep sending mails to mailboxes @example.com?

6

Use localhost for mydestination and myorigin

mydestination = localhost
myorigin = localhost

With this setup, when mdadm send email to root, it will transformed to root@localhost. With mydestination = localhost, postfix will consult /etc/aliases to do aliasing.

If you aren't comfortable with root@localhost in return-path, then you can use smtp_generic_maps to repair it

#main.cf
smtp_generic_maps = hash:/etc/postfix/rewrite

#/etc/postfix/rewrite
localhost example.com
  • Your solution works, but the mail headers now contains localhost instead of example.com : I get Return-Path: <colin@localhost> instead of Return-Path: <colin@example.com> for mail sent by the user colin. – Congelli501 May 5 '15 at 15:01
  • See updated answer – masegaloeh May 5 '15 at 22:13

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