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So, I am setting up a backup mail server.

I got it relaying messages (saving them to queue and then, as soon as primary's up, deliver them to primary). It took following two lines:

relay_domains = $mydestination domain.tld
smtpd_recipient_restrictions = permit_mynetworks
                               check_relay_domains

However. I want a secondary not only to relay messages, but also to store them to local mailboxes (provided, the local mailboxes with needed names exist), so I could access them in case of emergency via, say, roundcube webmail.

How do I make Postfix both relay and receive messages at the same time?

  • An MX20 relay is not best practice for postfix redundancy, its better to go with 2 equivalent MX10. If you are able to read german, I can suggest you to read this article from Heinlein: heinlein-support.de/upload/mk4/… – Henrik Jan 18 '15 at 10:36
  • Hell yes am I able to read German. Thanks for the article. – dr.Equivalent Jan 19 '15 at 16:56
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One solution can be to have the relay server has a fake domain and then using recipient_bcc_maps BCC all the messages to local addresses with the fake domain.

Add to main.cf the following:

recipient_bcc_maps = hash:/etc/postfix/recipient_bcc_maps

and also add fake.domain.com to the end of mydestination = ..., this way this server will get the all of the user@fake.domain.com e-mails (if the user exists).

In /etc/postfix/recipient_bcc_maps put:

user@your.domain.com user@fake.domain.com

than run postmap recipient_bcc_maps

This way to every message to user@your.domain.com a BCC will be added to user@fake.domain.com so the message will be stored locally.

  • I think, it might be something that would work. Could you please explain in more detail? – dr.Equivalent Jan 19 '15 at 0:30
  • You're welcome! – Stone Jan 20 '15 at 8:28
  • Can I apply some sort of wildcard, so that I'd not have to edit files every time users are added? – dr.Equivalent Jan 20 '15 at 13:42
  • Maybe by using prce based recipient_bcc_maps. Put recipient_bcc_maps = pcre:/etc/postfix/recipient_bcc_maps in main.cf, and /^(.*@your\.domain\.com)/ ${1}@fake.domain.com in it. But haven't tried it myself. – Stone Jan 20 '15 at 13:51
  • Looks like we're out of luck on this one, sadly. Or it needs to be addressed further. Anyway, thanks for the help, I really appreciate it. – dr.Equivalent Jan 20 '15 at 14:35

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