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Postfix backup server relay only if domain has MX of backup server
What is the correct syntax to have Postfix relay mail only if the domain has the correct MX records that match the backup server?
I know it is possible but i cannot figure out how to do it this time.
You need to list each domain, if you don't a spammer could simply set your server as the secondary MX and forward all mail for domain X to you, you will then relay it to domain X.
Originally Posted by cerrie
Check this link for setting up a backup MX:
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