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Messages stuck in outbox

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Archived post from March 15, 2018. Product: Windows Live Mail – no longer developed by its maker. Details may be out of date.

Question asked on Mar 15, 2018
I have several messages stuck in my outbox.  All written yesterday.  Error Message:  
The message could not be sent because the server rejected the sender's email address. The sender's email address was *** Email address is removed for privacy ***'.

Subject 'Re: Shield a Badge Program'
Server Error: 450
Server Response: 450 Requested mail action not taken: mailbox unavailable
Server: 'smtp.sbcglobal.yahoo.com'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 25
Secure(SSL): No

How can I send these messages?

[Moved from: Office / Outlook / Windows 10 / Unknown/other]

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