Over the past couple of days an issue has come up with email being sent to Yahoo.com or any of its hosted domains. (ie. sbcglobal.net, etc) The result of the problem is that users sending email to Yahoo or any of its sub domains may get a message indicating the message is being temporarily deferred. The message that is bounced back will contain something like the following;
Failed Recipient: username@yahoo.com.cn
Reason: Remote host said: 451 Message temporarily deferred - 4.16.50
The Remote Host is Yahoo. There is a long,technical, and stupid reason that this is occurring. I won't get in to all the details here. Unfortunately, there is very little that we or other ISPs can do to try to resolve the issue. Our hosting group has been trying to locate someone at Yahoo that they might be able to work with, with no luck. One thing that can be done is for Yahoo (or SBC) users that are not able to receive the emails that are being sent to them to complain to Yahoo (or SBC).
The issue has to do with the method Yahoo has chosen to try to block spam. While blocking spam is a necessary evil nowadays, the method they have chosen has gone way to far and in fact is broken. Our hosting group is trying several workarounds that are helping somewhat but none of them is a permanent solution.
I wanted to let our Clients know about this problem, the cause, and what we are trying to do about it. Unfortunately, in this case we must depend on Yahoo to resolve it at their side. Note that some email will in fact get through, but a large portion is failing. We will continue to attempt to resolve this issue with Yahoo. Our Clients can feel free to contact me with questions or for an update.
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