am kind of new to qmail and started a new job where there was already
qmail in place. I have been learning as I go and have run into a little
snag here that I cannot seem to find an answer to. The below error is
something I keep getting once in a while when sending an email through
Outlook 2003.

Your message did not reach some or all of the intended recipients.

     Subject:  FW: ShopforT1.com T1 (1.5 Mbits) Proposal for Baldwin
Research Insitiute
     Sent:     12/6/2006 12:19 PM

The following recipient(s) could not be reached:

     'Ryan Schwantes' on 12/6/2006 12:20 PM
           451 temporary RBL lookup error

Now the user that It says couldn't be found is somone internal. I'm not
sure why but they are being blocked even though we are using the qmail
server for the incoming as well as the outgoing email so I would think
it wouldn't block itself for spam abuse?? Maybe I am understanding the
error wrong, but at any rate, I need some assistance in what steps I
need to take to get this fixed. The odd thing is that if I send it
again but type out the full address (instead of using the name from
outlook) it worked, but if I go into the sent items and open it up, it
does show that the dame corresponds with the same email address.

Any suggestions would be most helpful,