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This is an example of the error message that pops up for each of the 19 messages stuck in Windows 7 Live Mail outbox:

The message could not be sent. The setting for your outgoing email [SMTP] server might need to be configured. To find the server settings for 'trespatch@roadrunner.com', please contact your email service provider.

Subject: 'In Case You Didn't Know . . .'
Server Error: 550
Server Response: 550
Invalid mailbox: trespatch@roadrunner.com [R0109005]
Server: 'smtp-server.roadrunner.com'
Windows Live Mail Error ID: 0x800CCC79
Protocol: SMTP
Port: 25
Secure (SSL): No service provider

How do I fix this?

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