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Reverse DNS does not match SMTP Banner. Which FQDN?

    Question

  • Hi,

    I just got the Reverse DNS setup by our IP provider but when i run mxtoolbox i get the error "Reverse DNS does not match SMTP Banner" now.
    I went to send connectors and looked at the FQDN there and it was mail.domain.se but when I look at receive connectors I have writen servername.domain.local ( which is the correct internal name ).

    My question is which one should I use and do I have to create any A hosts in my server or is this something my IP provider has to do?
    Wednesday, October 28, 2015 11:25 AM

Answers

  • The MX toolbox test is wrong.

    The tool is making a major presumption that the way your server answers inbound SMTP traffic is the same way that it announces itself with outbound traffic. That is not the case with Exchange.

    To "fix" the problem with Exchange can actually cause your email flow to stop.

    Don't touch your Receive Connectors.

    Use the method I have outlined on my blog to confirm your outbound banner works correctly for outbound email.

    http://semb.ee/bannertesting

    Simon.


    Simon Butler, Exchange MVP
    Blog | Exchange Resources | In the UK? Hire Me.

    Wednesday, October 28, 2015 11:34 AM

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