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    53 comments  ·  Office 365 Security & Compliance  ·  Flag idea as inappropriate…  ·  Admin →
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    Anonymous commented  · 

    I've had this problem, too.
    When my mail was sent, Exchange Online didn't check the other party's MX records, and tried to post it for 12 hours.
    The equivalent of my users need to send 12 hours before they know that the mail sent failed!
    It's really not being received!

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