Randy Cassingham's Blog

Posted by Bernie, San Diego, California on September 10, 2008:

Yahoo is also blocking hundreds of our legitimate emails.

We are a small ISP with about 5000 users. Only a very small percentage of our users can send email to Yahoo, and even that is sporadic.

Hundreds of our users' legitimate emails are rejected daily with the following message:
421 Message from (208.66.56.9) temporarily deferred - 4.16.50. Please refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html

Our email server tries tries resending deferred (queued) emails every 15, 30, 60, 90 and 120 minutes to Yahoo and Yahoo continues to defer all connections until our email server finally gives up on the delivery.

Our email server has never been blacklisted by any other mail server or any SBL organization.

I have filled out "Yahoo! Mail Delivery Issues Form" a few times. I get the following automated response message:
--------------------------------------------------------------------
Hello,

This is an automated message regarding your recent request for Yahoo!

Mail Customer Care support. We have received your message and willYa respond within the next 48 hours with an answer.

Thank you for reaching out to us. We look forward to helping you!

Sincerely,

Yahoo! Customer Care

**Please do not respond to this message as no one will receive it.
--------------------------------------------------------------------------

But I never received a response from Yahoo and they continue rejecting our users' legitimate emails.

After reading many forums and blogs, it appears that they are doing the same thing to many other small ISPs and companies with their own email servers.

This practice can interrupt many legitimate business communications and hurts many small businesses.

Does anyone know if Yahoo has recently revised their email acceptance policy or implemented new policies on accepting emails from competitor hosting companies?

Bernie