Thanks to Jerry for his response:
From - Jerry Berkman
"<>" means mailer-daemon. Possibly the message came in for a specified
user on your system, which is ok, but the user does not exists so the
mail is bounced back to the sender. I'd think there are more log
lines; grep for 12399 and see.
Original post:
> In the following mail.log entry I interpret that the message below as
> coming in from outside our network and being relayed directly outside our
> network. But that ought not be the case because relaying is not permitted
> by a sendmail 8.8.x setup that has been tested and we know it works. The
> fact that nrcpts=2 is shown below, but only 1 receipt is listed is puzzling.
> Please advise- here is the entry:
> Apr 17 09:18:08 castle sendmail[12399]: JAA0000012399:to=<usmc-masterinet.
> usmc.mil>, delay=00:00:03, mailer=local, stat=User unknown
> Apr 17 09:18:08 castle sendmail[12399]: JAA0000012399: from=<>, size=1593,
> class=0, pri=61593, nrcpts=2, msgid=<vines.Gbl6+bwoBpB_at_MQG-SMTP3.USMC.MIL>,
> proto=SMTP, relay=mqg-smtp3.usmc.mil [192.156.78.41]
Received on Sat Apr 18 1998 - 15:17:57 NZST