How to FIX: 0x800CCC78 Outlook Send-Receive error (Solved)

Continue reading below to learn how to fix the error 0x800CCC78 in the Outlook Send/Receive process. The 0x800CCC78 sending error in Outlook commonly arises when the SMTP server authentication is faulty or when the recipient address contains an invalid character.

This tutorial will show you how to fix the Outlook Sending problem 0x800CCC78:

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