Havent seen much on this but i have a feeling a lot of people are going to be having this problem. I am using Exchange 2003 however i dont the problem is related to Exchange so am putting this in the general Email area.
All of the sudden a domain on my Exchange 2003 server is getting blocked from yahoo.com and any domain hosted with them. I have filled out yahoo's form twcice with no response so am desperate for a fix. All mail comes back with this:
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<mailserver #5.5.0 smtp;554 Message type not allowed. UP Email not accepted for policy reasons. Please visit
http://help.yahoo.com/help/us/mail/defer/defer-04.html [#4.16.3:120]>
It is only affecting one domain on the server. They do send bulk emails with less than 100 people in the list, which is a distribution list in Outlook. I have reverse DNS for the IP on the server and have no problems sending email to any other addresses except yahoo hosted ones.
If you know anything about this and how to get it resolved PLEASE reply. Thank you!
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