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  1. D

    Outbox will not send, error code 0X800CCC78 with 550 sender restricted.

    Diane, I am not happy, I just typed a thread and the forum did not post it and upon recovery all details were gone. I can receive e-mails and have done everything on your past threads, Microsoft Support suggestions, and your website detail but cannot get my Outbox to send messages. I have...
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