Problems sending mail to yahoo?

Mon Apr 14 15:14:53 UTC 2008

On Thu, Apr 10, 2008 at 10:30 AM, Barry Shein <bzs at world.std.com> wrote:
>
<SNIP>
>        421 4.7.0 [TS01] Messages from MAILSERVERIP temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html
>
>     (where MAILSERVERIP is one of our mail server ip addresses)
>

Domainkeys solved my problem. I had the exact same thing happen,
sometimes it wouldn't even make it to the box. Setup domain keys, and
my problem went away.