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#
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# Postfix Admin
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# by Mischa Peters <mischa at high5 dot net>
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# Copyright (c) 2002 - 2005 High5!
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# Licensed under GPL for more info check GPL-LICENSE.TXT
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#
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Please follow these steps if your mailserver is used as a backup MX for some
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(or all) of your domains.
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Note: The setup described in this file only checks the domain, not the full
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mail address.
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You should use "reject_unverified_recipient" in your postfix config or setup
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"relay_recipient_maps" with a list of valid mail adresses on the primary mx
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to avoid that your backup MX accepts mails for non-existing recipient adresses.
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Without this, your backup MX might become a backscatter source.
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1. Modify main.cf
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-----------------
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In order for Postfix to use MySQL for relay_domains add the following
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to your main.cf
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relay_domains = proxy:mysql:/usr/local/etc/postfix/mysql_relay_domains_maps.cf
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2. mysql_relay_domains_maps.cf
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------------------------------
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You will need to put this into a text file for postfix to pickup.
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user = postfix
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password = password
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hosts = localhost
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dbname = postfix
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query = SELECT domain FROM domain WHERE domain = '%s' AND backupmx = '1'
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3. Restart Postfix
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-------------------
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When you are done make sure to restart Postfix so the changes take effect.
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