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450 Requested mail action not taken: Invalid IP (Solution)

Discussion in 'E-mail Discussions' started by ddcarnage, Jul 9, 2007.

  1. ddcarnage

    ddcarnage Member

    Mar 1, 2006
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    I had a problem with my server that I solved and I thought I'd share the solution with you because I didn't find anything relevant information about it on google or on this forum.

    For a reason that I won't discuss here, mail for an account located on server1 was being sent through the smtp of server2. Authentification was on and all.

    However, the emails were rejected by a certain destination with the error : 450 Requested mail action not taken: Invalid IP

    Solution was that the domain name needed and SPF record that stated that mail for that domain could originate from server2. So it was being blocked by a spam protection.

    So if my client's domain is and my two servers are and,'s dns entry needs

    TXT "v=spf1 ?all"
    But you can create an SPF record for you domain using the nice tutorial here :

    Hope this will help someone out there ;)


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