SMTP 553 Error w/ ATT Broadband - Can't send email
Ie.
The sender address bob@Xxxxx.com was rejected by the server smtp.att.yahoo.com.
Select a different outgoing mail server from the list below or click Try Later to leave the message in your Outbox until it can be delivered.
Sending from: Bob Xxxxx <bob@Xxxxxa.com>
ATT responded to the problem and explained that the capital X is the reason that the message is being rejected and that everything needed to be in lowercase. I have deleted the account and it all appears in lowercase, however ATT and the error message is still reporting a capital X.
What can be causing this and what is the solution. I have deleted and re-added the account and everything appears to be in lowercase.
Thanks.
Mac Pro, Mac OS X (10.5.3), Mac Mail issue - SMTP Sending 553 Error