[Mailman-Users] Mailman postings deferred by Yahoo

[Stephen J. Turnbull]

Attila Kinali writes:

 > On Wed, 20 Feb 2008 05:15:58 -0600
 > "Rick Harris" <rick at learntime.com> wrote:
 > 
 > 
 > > whateveraddress at yahoo.com R=lookuphost T=remote_smtp defer (0): SMTP error
 > > from remote mail server after initial connection: host g.mx.mail.yahoo.com
 > > [206.190.53.191]: 421 4.7.0 [TS02] Messages from 216.104.33.122 temporarily
 > > deferred due to user complaints - 4.16.56.1; see
 > > http://postmaster.yahoo.com/421-ts02.html
 > 
 > Same here, although i get a TS01 instead of a TS02. And 10'000 a day of those.

This is just selective greylisting, which lots of sites use as a
blanket policy.

A look at

    http://help.yahoo.com/l/us/yahoo/mail/postmaster/postmaster-15.html

suggests that Yahoo doesn't have a clue about discussion lists.  They
seem to think that all mailing lists are announcement lists (of course
that's apparently the OP's case).  Consider this list:

    Other great resources:

    * Help For Marketers by Scott Hazen Mueller
    * Marketing on the Internet Without Getting Burned by John C. Mozena
    * ESPC's best practices
    * How to Advertise Responsibly Using E-Mail and Newsgroups (RFC 3098)
    * MAAWG Sender BCP Version 1.1

:-(

If you're in a hosted environment, you might think about asking your
host to implement domain keys and/or PGP-signing your mail.  (Mailman
is (was?) not friendly to domain keys of non-owner posters, but in the
case of an announcement list having the host sign the post should work
fine.)