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After Upgrade from 17.0.8 to 17.1.1 O365 Email is only transferred occasionally with MTA still off

GaryChancellor

I upgraded to 17.1.1 this weekend and now my O365 email is transferring but only sporadically. The logs and policy checks show no problem.I have not turned on MTA with O365 (I am not ready to make any changes). Everything else on the firewall seems to work ok. I have added the complete list of O365 Web Exceptions and it has not made any difference. It was all working very well prior to the upgrade to 17.1.1.

Anyone else have this issue? Any clues on what to look for? I am only seeing Accepted in the Logs for O365 domains and IP addresses. The fact that it does transfer occasionally means it isn't a FW rule or web exception missing (I think).

Thanks,

Gary



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    More detail of the issue is: it is only failing with the Apple MacOS Mail client. Outlook clients do not have a problem. It is weird/odd that I can rebuild my mail file and then it will sync with O365. Otherwise it is totally random when it will successfully sync.

    Thanks,

    Gary

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    More detail of the issue is: it is only failing with the Apple MacOS Mail client. Outlook clients do not have a problem. It is weird/odd that I can rebuild my mail file and then it will sync with O365. Otherwise it is totally random when it will successfully sync.

    Thanks,

    Gary

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