Wed Sep 24 18:25:19 UTC 2008
John Kordash <kordash at supplyscape.com>

> Okay,
> Yahoo is bumming me. Only system my mail is having an issue
> with. All mail
> is accepted, but junked. I can only think it is the DKIM/Domain keys.

Just a WAG, but make sure you have a PTR record for your machine that is sending email.

If you actually got the bounce, check the headers, it is the first best place to look.