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  • 1.  Not able to communicate with our clients due to being spam filtered (O365)

    Posted Jan 25, 2017 03:14 PM

    Hi there,

    We run our email on office 365 and we keep getting -

    550 5.0.350 Remote server returned an error -> 553 Message filtered. Refer to the Troubleshooting page at;http://www.symanteccloud.com/troubleshooting for more;information. (#5.7.1)

    Out clients can't send to us and they get the same error #5.7.1

    This just started happening a couple of days ago and has never happened before. This only happens with symantec/messagelabs, every other email provider is fine. SPF and DKIM are fine, no blacklists.

    How can we fix this? This is a huge pain and is disrupting our business.

    Thanks.



  • 2.  RE: Not able to communicate with our clients due to being spam filtered (O365)
    Best Answer

    Posted Jan 31, 2017 04:04 AM

    Hi Vlad,

    It looks like the emails are being blocked as spam and if they are legitimate you will need to follw the process outlined in the link below:

    https://support.symantec.com/en_US/article.TECH82881.html

    Kind regards

    Kevin Brosnan

    Tier 2 Senior Technical Support Engineer



  • 3.  RE: Not able to communicate with our clients due to being spam filtered (O365)

    Posted Feb 02, 2017 11:18 AM

    Hi Vlad,

    Just following up on this FP issue and wondered if you still have the issue. If so please do let me know once the samples have been sent. Of if the signatures have since been removed and the issue is no longer happening. Please set the Thread as resolved to prevent other people making comments on this.

    Kind regards

    Kevin Brosnan



  • 4.  RE: Not able to communicate with our clients due to being spam filtered (O365)

    Posted Feb 02, 2017 11:21 AM

    We have sent in the samples and I believe the issue is solved for now.

    Thanks.