North American Network Operators Group

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Re: Yahoo! Mail/Sys Admin

  • From: Chris Turan
  • Date: Fri Oct 05 10:09:16 2007

Justin Wilson wrote:
We've been having trouble sending to * Getting the infamous
421 Message from (x.x.x.x) temporarily deferred - 4.16.50. Please refer to

I've actually had quite a bit of success with Yahoo. They're slow in replying so you have to know what to ask for.

Ask them to add you to their white-list.

Once the techs respond, they'll send you a long questionnaire about your
mail servers, management practices, and company policies.  Fill it out
and mail it back to them.

You'll be put on a two week monitoring period where they'll monitor
e-mails coming from your servers.  At the end of the two weeks, they'll
approve you if you are legit.

Just grin and bear it.  Include all relevant information in *every*
e-mail you send them.  You'll most likely talk to someone new every
time.  If you're patient and craft well-worded e-mails, you should be on
their white-list in about three or four weeks.

I did exactly this and so far the yahoo mail servers haven't been too
troublesome.  They slow down the connections sometimes, but it usually
goes through after an hour or two.