Why will Outlook Email not send message?
Recently, Windows Live Mail client returns the error message below when trying to send message: As of 4/28/23, Sent folder shows messages sent. Now all messages are stuck in Outbox folder. Windows Live Mail 2011 on Windows 7 Pro.
The message could not be sent because the server rejected the sender's email address. The sender's email address was '[address deleted]'.
Server Error: 550
Server Response: 550 5.1.0 <[email protected]> sender rejected. The email address you are sending as must match the email address you used to auth. Please check your SMTP settings. AUP#Out-1500
Windows Live Mail Error ID: 0x800CCC78
Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity.
Windows Live Mail Error ID: 0x800CCC0F
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