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Not receiving mail from several other domains

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  • Not receiving mail from several other domains

    We have a customer and they have a problem.
    They are not receiving mail from several other domains.
    It started with 1 domain but the list is growing.

    They have an exchange server with exchange 2003 and we have McAfee 8.5 enterprise / Spamfighter running on the server.

    We make use of an Zywall 5

    The mails are not in the spambox , and the domains are not blacklisted in spamfighter and we can`t see the mails in the log iof the zywall

  • #2
    Re: Not receiving mail from several other domains

    Sounds like their server is blacklisted. Do you have anyway of obtaining the NDR recieved by the sendee assuming they recieved one?

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    • #3
      Re: Not receiving mail from several other domains

      We found the problem.
      The problem seem to be in the firewall.
      If we check the option disable DoS attack protection on the Wan1 in the Firewall in the tab threshold the mails come through.

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