Windows Live Mail

I have Windows Live Mail 2015 and it won’t let me send emails. This is the error message I get:

Unanswered 0 answers

Archived post from December 18, 2015. Product: Windows Live Mail – no longer developed by its maker. Details may be out of date.

Question asked on Dec 18, 2015
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 'test'
Server Error: 553
Server Response: 553 Authentication is required to send mail as <*** Email address is removed for privacy ***>
Server: 'smtp.suddenlink.net'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 25
Secure(SSL): No

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