On Fri, Mar 7, 2008 at 2:58 PM, Mark Sapiro <[EMAIL PROTECTED]> 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[216.39.53.1] refused to talk to me: 421 4.7.0 > [TS01] Messages from 72.52.113.16 temporarily deferred due to user > complaints - 4.16.55.1; 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[206.190.53.191] said: 451 Message temporarily > deferred - [250] (in reply to end of DATA command) > > and > > host c.mx.mail.yahoo.com[216.39.53.3] 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) > > and > > host c.mx.mail.yahoo.com[68.142.237.182] refused to talk to me: 421 > Message temporarily deferred - 4.16.55.1. Please refer to > http://help.yahoo.com/help/us/mail/defer/defer-06.html
This is greylisting: http://greylisting.org 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. --Matt ------------------------------------------------------ Mailman-Users mailing list Mailman-Users@python.org http://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://www.python.org/cgi-bin/faqw-mm.py Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: http://mail.python.org/mailman/options/mailman-users/archive%40jab.org Security Policy: http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq01.027.htp
