I can send an email from Windows mail with no problem. But sending an email generated from Quickbooks which launches Windows mail fails everytime. This has worked for 2 years without a problem and I can not trace out the problem. This is the error info.

The message could not be sent. The authentication setting might not be correct for your outgoing e-mail [SMTP] server. For help solving this problem, go to Help, search for "Troubleshoot Windows Mail", and read the "I'm having problems sending e-mail" section. If you need help determining the proper server settings, please contact your e-mail service provider.
The rejected e-mail address was 'morrison2002@aol.com'. Subject 'Sales Receipt from Home Theater and Satellite', Account: 'AOL Mail', Server: 'smtp.aol.com', Protocol: SMTP, Server Response: '550 5.1.1 <morrison2002@aol.com>: Recipient address rejected: aol.com', Port: 587, Secure(SSL): Yes, Server Error: 550, Error Number: 0x800CCC79

I have checked that setting early on. I have read all the posts I could find and tried them all. Including changing from IMAP and then changing back.

This problem seems to be off the beaten path. Because I can send emails directly out of Microsoft mail I have to believe its a Quickbooks problem. I really do not want to pay their high consulting fees to fix thier software!