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pf stuffing sendmail?

Hey all
I don't know if this is a pf question but I think pf might be causing
it so here comes the question.
I have recently started to notice a stack of the following popping up
on the logging server from the border firewall. It runs OBSD 3.5 with a
pf ruleset.
The log messages (usually several hundred a day) are (2 examples)
Sep 28 06:01:17 draco sm-msp-queue[28462]: i8OJU1Xl011892: to=root,
delay=3+00:30:01, xdelay=00:00:00, mailer=relay, pri=13083226,
relay=[], dsn=4.0.0, stat=Deferred: Connection timed out with
Sep 28 06:01:17 draco sm-msp-queue[28462]: i8OJU1Xm011892:
to=postmaster, delay=3+00:29:59, xdelay=00:00:00, mailer=relay,
pri=13084892, relay=[], dsn=4.0.0, stat=Deferred: Connection
timed out with []
Now, I originally thought that sendmail had stopped accepting
connections but no, it is still doing that. I can "telnet localhost 25"
and it happily answers back:
border# telnet localhost 25
Trying ::1...
Connected to localhost.
Escape character is '^]'.
220 border.xxxxx.com ESMTP Sendmail 8.12.11/8.12.11; Wed, 29 Sep 2004
09:27:45 +1000 (EST)
I am actually not sure what is even trying to send email as the only
things running on the box are pf and some IP accounting stuff. I guess
it is the OBSD standard security/cron scripts.
The pf.conf is a deny by default but I have a line:
pass quick on lo0 all
.so connections from the box to itself should be fine.
So, yeah, any ideas?
PS. I have googled around and can't seem to find much. eg tried all the
things in these:
And in /etc/hosts I have a line: localhost.localdomain localhost
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