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MX backup server with postfix on debian

Not to lose mails when main mail server is down, best solution is – mx backup server.

This is configuration to have backup mx server set up and running.

create /etc/postfix/relaydomains with contents:

then to create map for postfix – run:

create /etc/postfix/transportmaps with contents:

and run:

Backup MX should be added in DNS zone in order to receive mails.
In my case I have such records:

First digit means priority. The bigger value, the smaller priority.
So my MX backup server is mx2. It receives mail only if higher priority server is down.

That’s it.

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