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* 1.4 DOS_OUTLOOK_TO_MX Delivered direct to MX with Outlook headers

Discussion in 'E-mail Discussions' started by mikefromnz, Apr 3, 2017.

  1. mikefromnz

    mikefromnz Active Member

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    Hey guys,

    I am running a small shared hosting server and I redirect all my emails to a smart host provider (smtp2go)

    I have noticed that if my customer uses Outlook as their mail client, and sends an email to another host using SpamAssassin, it triggers the following rule

    * 1.4 DOS_OUTLOOK_TO_MX
    Delivered direct to MX with Outlook headers

    This is a bit of a pain, and looks to be caused because the "recieved: from" headers are only showing the SMTP2GO server, not mine or the customers local machine, whereas this rule states if it had some more headers it would not trigger.

    Any ideas?
     
  2. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello,

    Is the "Enable Sender Rewriting Scheme (SRS) Support" option enabled in "WHM >> Service Configuration >> Exim Configuration Manager >> Basic Editor" on this system?

    This option rewrites sender addresses so that the email appears to come from the forwarding mail server. This allows forwarded email to pass an SPF check on the receiving server.

    Thank you.
     
  3. mikefromnz

    mikefromnz Active Member

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    Yes it is, although I don't think this would be the cause of the issue?

    What I mean is the email headers usually include
    And if it was sent from their home/office computer using Microsoft Outlook, you usually see more than one "received from" header as it goes through each server.

    With my Exim using a 3rd party smart host, I am not seeing even my own server under the "received from" just simply the 3rd party smart host's server (smtp2go) and also not seeing the customers own machine

    The problem this creates is it triggers the DOS_OUTLOOK_TO_MX SpamAssassin rule which is due to having the header below come very shortly after the "received from" with no other servers in list, with the logic that it must have been sent direct from a mail server using Outlook (client software), in which case that'd be a bit dodgy!

     
  4. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello,

    I recommend reporting this to the support team for the email service you are using (SMTP2GO) to see if there are any settings to enable to allow this data to pass through.

    Thank you.
     
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