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02-23-2010 11:02 AM - last edited on 09-12-2013 10:37 AM by ATTMarianaCM
The error message 551 not our customer is a response that came from the AT&T Yahoo! remote e-mail server and it only affects Bellsouth members that are migrated to Yahoo! and are using client e-mail software such as Outlook and Outlook Express.
This issue has already been resolved as of February 22, 2010 12:38:00 PM CST. If you cannot still send e-mail, please make sure that you use the following server settings:
Incoming Server: pop.att.yahoo.com;
Outgoing Server: smtp.att.yahoo.com;
Outgoing server (SMTP) requires authentication box is checked.
Otherwise, you may contact our AT&T eChat help desk for further assistance by clicking the link below.