Some mail from dragonfly.users being rejected

[Vincent Stemen <vince.dragonfly@xxxxxxxxxxx>]

Hi.

I subscribed to the dragonfly.users mailing list yesterday.  I received
the confirmation messages and I have received both postings since them
from Justin C. Sherrill.  However, the two replies to him and
3 additional postings have been rejected from my mail server because
crater is rejecting the sender verify connection.  Here is my mail log
entry on one of the rejected ones.

2008-01-28 11:41:08 H=crater.dragonflybsd.org [216.240.41.25] sender verify defer for <users-errors@crater.dragonflybsd.org>: could not connect to crater.dragonflybsd.org [216.240.41.25]: Connection refused
2008-01-28 11:41:08 H=crater.dragonflybsd.org [216.240.41.25] F=<users-errors@crater.dragonflybsd.org> temporarily rejected RCPT <vince.dragonfly@hightek.org>: Could not complete sender verify callout

Any idea why crater rejects some sender verify connections and not
others?

Good thing we run our own virtual dedicated server and have root access
to our mail logs, or I would not have been able to determine why some of
the list mail is not getting through.

I discovered it when I received a reply from Justin to Simon but had not
received the posting from Simon.  I checked the list via the nntp server
and discovered the 5 other postings I have not received.