Entourage

Without knowing something about the address that you are sending from or sending to, there is nothing that anyone can do. If, however, you are trying to use Entourage as the mail client for an ordinary Yahoo! Mail account, then you can't. POP3 access is available only on Yahoo paid service.
 
You need to verify the email address you are using with Yahoo Mail. You must have AT & T, or sbcglobal as your main ISP. They want to make sure it is you who are sending emails out and not some spammer.
Follow the instructions from that web page giving them your 'other' email address, and you should not have anymore problems.
 
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