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Fix Advanced Threat Protection Attachment Scan When Email Is Auto-Forwarded

Currently ATP fails to release an attachment (continually displays ATP Scan in Progress in place of actual attachment) when the email with the "stuck" attachment has been auto-forwarded by a user with an Out-of-Office rule in place within the same email domain. Strangely, the email attachment is scanned just fine from the auto-forwarding recipient and can be manually forwarded to any recipient, but if it's auto-forwarded, the attachment stays stuck in an never displays as available. This has been reported to MS Support who attempted a work-around (which failed) Office 365 Ticket #30126-5487056 .

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James Moyer shared this idea  ·   ·  Flag idea as inappropriate…  ·  Admin →


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  • Mike commented  ·   ·  Flag as inappropriate

    I am running into this issue as well... Any update as to a fix? This is happening to me on mail being forwarded from one Office 365 to another via mail flow rules in Office 365.

  • Margaret Tito commented  ·   ·  Flag as inappropriate

    Please help, Office 365 ATP has encounter an error during processing. This keeps popping up on my phone when i want to look at an email in my Microsoft outlook emails
    I was told by our IT guy to open the email on my desktop and then open my phone and let it scan until it finishes. This still not has worked. Urgent assistance required please.

  • Joe M commented  ·   ·  Flag as inappropriate

    Workaround: Anytime an atp appears stuck (more than 5-10 minutes scanning), forward a copy of the message to yourself and the attachments will magically appear

  • Rodney Austin commented  ·   ·  Flag as inappropriate

    I am having this issue as well. But it is happening randomly to my users. No auto fardward was used. End user received email that was manually forwarded by sender.

  • Ricardo commented  ·   ·  Flag as inappropriate

    This problem it happens to me with one user of outlook. Some body has been found a solution?


  • Satu commented  ·   ·  Flag as inappropriate

    This is should be fixed soon. Delay the delivery of forwarted messages rule could be the workaround for this now, but hoppefully this can be fix soon.

  • Anonymous commented  ·   ·  Flag as inappropriate

    Has anyone found a way around this issue? The only solution we have come up with short of disabling ATP and dynamic delivery, is to have the user who will be out of office delegate their mailbox instead of auto-forwarding it when OOO.

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