Yes, we are in exactly the same situation. Our mailserver receives a lot of mail for various domains, and forwards to various users with xtra addresses. We are getting the exact same error - deferred etc I received this response from yahoo yesterday.. They are claiming it's a problem with xtra's server - I think someone at yahoo hasn't been informed that xtra's mailserver is now managed by yahoo! Come on guys! From: Yahoo! AUNZ [mailto:au-mail(a)cc.yahoo-inc.com] Sent: Tuesday, August 28, 2007 12:33 PM To: craig(a)spiers.gen.nz Subject: Re: 'Failed Delivery' Message (KMM86385258V61206L0KM) Hello Craig, Thank you for contacting Yahoo! Support Services. We regret to hear about the issue you have described. However, based on the details you have provided, we believe the issue is related to a spam or antivirus mail filter executed on the receiver's mail server. Since this is not a Yahoo! Mail server, we will be unable to advise you any further, as we do not have access or control over this. If you require further assistance, please contact the support staff or postmaster for the domain where you are attempting to send to. The domain is the portion after the @ symbol in the email address. Thank you again for contacting Yahoo! Customer Care. Regards, Amanda Senior Customer Care Specialist Yahoo!7 Customer Care http://au.help.yahoo.com http://au.help.yahoo.com/ _____ From: Michael J. Densem [mailto:mike(a)massive.co.nz] Sent: Wednesday, August 29, 2007 4:07 PM To: nznog(a)list.waikato.ac.nz Subject: [nznog] Continued problems with xtra email Can anyone help? Since Xtra changed over its email service to Yahoo! I have had problems. I have a server (outside of the Xtra network) that handles email for around 50 domains. Many of these are collection points that forward to client recipients with @xtra.co.nz addresses. Due to the large volume of email traffic sending to the xtra.co.nz domain, the Yahoo servers are now blocking/grey-listing my server. I have filled out the forms on the Yahoo website and have spoken to Xtra. However, I have had no response from Yahoo and Xtra doesn't seem to understand or appreciate the issue. Is anyone else in a similar situation? Had similar issues? Does anyone know a solution? The response from the Yahoo servers is '451 Message temporarily deferred' (meaning Yahoo first denies the initial attempt and waits for a re-try). However, none of the re-tries is accepted and the message eventually expires. Any suggestions would be appreciated. Cheers, Mike Densem mike(a)massive.co.nz