Email Threat Detection and Response

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  • 1.  Issue with delivering emails to messagelabs.com

    Posted Feb 07, 2018 07:40 AM

    Hello, we have serious problem with delivering emails to messagelabs.com cloud. It seems all emails which contains domain "mauriceward.com" in body are dropped or sometimes rejected without any legitimate reason.

    I already checked your IP blacklist and our IP (91.205.195.59) is not listed there. I also tried to check various other blacklists but I didn't find our IP or domain in any blacklist.

    Could you please look why the problem occure. If it's needed I can provide you details about emails which were silently dropped at your side.

     

    Thank you & best regards,

    Zdenek Z.



  • 2.  RE: Issue with delivering emails to messagelabs.com

    Posted Feb 07, 2018 07:42 AM

    Submit a sample of the email that's blocked to:

    investigation@review.symantec.com 

    reference link: http://www.symantec.com/docs/TECH82881



  • 3.  RE: Issue with delivering emails to messagelabs.com

    Posted Feb 07, 2018 10:24 AM

    Zdenek - we are seeing this also when sending via our mail host to all domains hosted by Messagelabs - started around 10am GMT, but no other reports seen. All other email traffic is fine and has been successfully replicated by sending from our domain, from gmail and another domain to the same various destination domains - all are blocked by Messagelabs. Contacted our mail host and they confirm problem appears to be a third party one. Brian's comment about sending a sample has been copied and pasted into similar queries.