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It looks like they are grey listing you.
That's the return code our grey listing system uses. On our
servers that grey list, the first time you try to deliver email from a new
address we return the 451 code. You must retry again after 60 seconds, within 24
hours, and your mail will be accepted. Then that email address is white listed
for 24 hours.
I don't recommend grey listing, it will delay email
delivery for hours, and some servers will not try back. We use it in particular
circumstances.
Paul Fuhrmeister
From: Message Sniffer Community [mailto:[EMAIL PROTECTED] On Behalf Of Jonathan Hickman Sent: Thursday, October 26, 2006 9:20 AM To: Message Sniffer Community Subject: [sniffer] Yahoo! Email Delivery We are still getting this error from Yahoo!
servers when attempting to send email to people on their domain:
Reason: Remote host said: 451 Message temporarily deferred -
4.16.50
I recall others encountering this
difficulty. What did you do or what did Yahoo! tell you was the
cause? It seems like every message sent to yahoo.com is being bounced with
that message. I cannot contact their abuse or support departments because
those emails bounce with the same error.
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