Sendmail / Milter problem

I have sendmail running with a custom milter and noticed that
occasionaly sendmail doesn't call the milter but passes the mail
through. The times I have seen this happen the maillog appears to
have two "from=<" entries to the same sendmail process (Note maillog
below). I also noted that the first from= doesn't have a message
size or message id. I'm guessing something happened while collecting
the MAIL FROM: but I'm not familiar with the sendmail code.
This happened on a Fedora core 6 system with sendmail 8.13.8 running
on an Intel core 2 duo with 8 GB of real memory. There were no
messages in the /var/log/messages file for this time nor the secure
log file. Log rotate for the maillog runs at midnight instead of
04:00. I changed the destination domain name to protect the innocent.
Any help would be appreciated.
Paul Turner

First from= Jan 11 04:33:25 s_sys@fe80023048fffe8e4dea sendmail[3004]:
m0BAXFZH003004: from=, size=0, class=0,
nrcpts=1, proto=SMTP, daemon=MTA2, relay=[124.81.4.18]rner users
21348478 Dec 5 08:34 ml1
The First from= Jan 11 04:33:28 s_sys@fe80023048fffe8e4dea sendmail[3008]:
m0BAXJlV003008: from=, size=0, class=0,
nrcpts=1, proto=ESMTP, daemon=MTA2, relay=85-20-132-36-
static.albacom.net [85.20.132.36] (may be forged)
Another from= Jan 11 04:33:33 s_sys@fe80023048fffe8e4dea sendmail[3008]:
m0BAXJlX003008: from=, size=613, class=0,
nrcpts=1, msgid=<01c8537c$9de2dd80$24841455@mexicansu1>, proto=ESMTP,
daemon=MTA2, relay=85-20-132-36-static.albacom.net [85.20.132.36] (may
be forged)
Jan 11 04:33:33 s_sys@fe80023048fffe8e4dea sendmail[3014]:
STARTTLS=client, relay=10.1.5.1., version=TLSv1/SSLv3, verify=FAIL,
cipher=AES256-SHA, bits=256/256
Jan 11 04:33:33 s_sys@fe80023048fffe8e4dea sendmail[3014]:
m0BAXJlX003008: to=, delay=00:00:01,
xdelay=00:00:00, mailer=smtp, pri=120613, relay=10.1.5.1. [10.1.5.1],
dsn=2.0.0, stat=Sent (ok 1200047599 qp 30433)
Jan 11 04:33:36 s_sys@fe80023048fffe8e4dea sendmail[2971]:
m0BAVoaT002971: SYSERR(root): collect: read timeout on connection from
[118.172.29.3], from=
Jan 11 04:33:36 s_sys@fe80023048fffe8e4dea sendmail[2971]:
m0BAVoaT002971: from=, size=15637, class=0,
nrcpts=1, proto=ESMTP, daemon=MTA2, relay=[118.172.29.3]
Second from= Jan 11 04:33:36 s_sys@fe80023048fffe8e4dea sendmail[3004]:
m0BAXFZK003004: from=, size=3222, class=0,
nrcpts=1, msgid=<20080111123125.4191.qmail@foa2>, proto=SMTP,
daemon=MTA2, relay=[124.81.4.18]
Jan 11 04:33:36 s_sys@fe80023048fffe8e4dea sendmail[3016]:
STARTTLS=client, relay=10.1.5.1., version=TLSv1/SSLv3, verify=FAIL,
cipher=AES256-SHA, bits=256/256
The to= Jan 11 04:33:36 s_sys@fe80023048fffe8e4dea sendmail[3016]:
m0BAXFZK003004: to=, delay=00:00:05, xdelay=00:00:00,
mailer=smtp, pri=123222, relay=10.1.5.1. [10.1.5.1], dsn=2.0.0,
stat=Sent (ok 1200047602 qp 30444)