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  1. #1
    Join Date
    Jun 2013
    Posts
    141

    Postfix backup server relay only if domain has MX of backup server

    Hi All,

    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.

    Thanks.

  2. #2
    Quote Originally Posted by cerrie View Post
    Hi All,

    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.

    Thanks.
    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.

    Check this link for setting up a backup MX:
    http://www.postfix.org/STANDARD_CONF...ME.html#backup
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