[Mailman-Users] Ongoing delivery issues - First Yahoo, now AOL
minxmertzmomo at gmail.com
Sat Mar 8 15:07:50 CET 2008
On Fri, Mar 7, 2008 at 2:58 PM, Mark Sapiro <mark at msapiro.net> wrote:
> Rick Harris wrote:
> >I posted a couple of weeks ago regarding mail not being delivered to Yahoo
> >addresses. I've all but written that off as an Internet black hole.
> >Messages from my list almost never make it to Yahoo recipients. If I post
> >to the list, and cc a Yahoo address, then that works fine. Background noise
> >only, none of this matters today.
> Since your original post on this issue, I have looked at my maillog and
> I see lots of these
> host e.mx.mail.yahoo.com[18.104.22.168] refused to talk to me: 421 4.7.0
> [TS01] Messages from 22.214.171.124 temporarily deferred due to user
> complaints - 126.96.36.199; see http://postmaster.yahoo.com/421-ts01.html
> type messages (3500 in the last month, but only 46 in the last 5 days).
> I also get lots of
> host g.mx.mail.yahoo.com[188.8.131.52] said: 451 Message temporarily
> deferred -  (in reply to end of DATA command)
> host c.mx.mail.yahoo.com[184.108.40.206] said: 421 Message temporarily
> deferred - 4.16.51. Please refer to
> http://help.yahoo.com/help/us/mail/defer/defer-06.html (in reply to
> end of DATA command)
> host c.mx.mail.yahoo.com[220.127.116.11] refused to talk to me: 421
> Message temporarily deferred - 18.104.22.168. Please refer to
This is greylisting:
in which the receiving MTA responds with a temporary failure to
suspicious or unknown senders. It kills a lot of spam, because most
spam is sent by non-compliant MTAs that don't bother retrying.
> The important thing is that in my case at least, every one of these is
> successfully retried, either immediately via a different MX or after 1
> or a few delayed retries. All of these messages were eventually
> accepted by Yahoo and I have gotten zero complaints of missing mail
> from Yahoo list members.
> Perhaps there is some issue with your outbound MTA not retrying these
> 421 and 451 status returns.
Ditto. Rick, are you in charge of your MTA? One way or another, you
should figure out how your MTA handles temporary failures and retries.
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