Outlook 365 - Sending Error 0x800CCC78 - Microsoft Community


i using outlook 365 (listed version 15.0.4885.1001), pop/smtp, , have no trouble receiving emails, cannot send. can still send browser access, , problem has occurred today (with no changes anti-virus software, usage habits or software). error message displayed below:

task *** email address removed privacy *** - sending' reported error (0x800ccc78) : 'cannot send message. verify e-mail address in account properties.  the server responded: 535 5.7.8 [tpg-a02] authentication denied. user *** email address removed privacy *** banned using smtp auth due previous abuse'

thank help.

check link out: https://support.office.com/en-us/article/i-receive-a-550-553-or-relay-prohibited-error-when-sending-email-messages-65b494a4-0a15-433e-829f-e73651e0245e


Office / Outlook / Windows 10 / Office 365 Home



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