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SPF Fail, internal IP

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2018-10-23
2018-10-23
  • Thomas Steel

    Thomas Steel - 2018-10-23

    HI everyone
    Have a interesting problem with our SPF check
    The logs are showing that all traffic is coming from our internal IP of our router. And not the external IP of the senders mail server.
    We didn’t change anything, just over the weekend it randomly started using the internal IP, and because of this, SPF checks are failing and email is being bounced.

    Any ideas where we can start to try resolve this, as we have tried everything we can think of and still can’t figure it out.

    Thanks in advance

     
  • Kevin O'Connor

    Kevin O'Connor - 2018-10-23

    Well you've got a NAT of somesort setup on your firewall but you do't give enough info to gave a solution. Quick fix while you resolve is to turn spf off or to put the internal IP on the inbound trusted settings

     

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