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Exchange 2007 SMTP connector


I have Exchange 2007 SP2 and before 18 october everything working fine, after 18 i start getting this error message
smtp112.biz.mail.sp1.yahoo.com #553 From address not verified - see http://help.yahoo.com/l/us/yahoo/mail/original/manage/sendfrom-07.html ##

from 18 till yesterday the user must send the email two to three times to be delivered and today i start getting all the mail bounced, i contact yahoo but there no clear message from them, i have arround 6 domains , i try all of them but with no luck all mail are bounced today.

from microsoft outlook (no send connector) working fine - from online same working fine, when i start using smtp connector it stard bounce the mail.

please i need your help
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2 Solutions
Try wrote username in proper case? some of yahoo servers case-sensitive, same case-insensetive

rasa78Author Commented:
thanks morpheios, but still the same problem :( yesterday some mails are going and some bouce , but today nothing are going i also disabled the antivirus (Symantec EndPoint protection) but still the same problem.
nashim khanExchange AdministratorCommented:
Hi Rasa78,
Please run nslookup and try to find out the output.

or try this if not resolve please revert. And follow the below article it will help you to fix your issue.

Thank's & Regard's
Nashim Khan
rasa78Author Commented:
I conplained to yahoo regarding my problem and thay fixed the problem , it is a general problem from yahoo small business.


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