I have Exchange 2007 SP2 and before 18 october everything working fine, after 18 i start getting this error message
.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