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Unable to send with smtp.comcast.net, error 550 5.1.1 Not our Customer

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Archived post from April 4, 2016. Product: Windows Live Mail – no longer developed by its maker. Details may be out of date.

Question asked on Apr 4, 2016

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 *** Email address is removed for privacy ***', please contact your email service provider.

Subject 'Fw: another story about Chris Stevens'

Server Error: 550

Server Response: 550 5.1.1 Not our Customer

Server: 'smtp.comcast.net'

Windows Live Mail Error ID: 0x800CCC79

Protocol: SMTP

Port: 587

Secure(SSL): Yes

[Original subject: The problem is shown below...Please help!!!! ...]

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