[cobalt-users] [raq4i] Sendmail NOQUEUE: error

["John Cordeiro" <jcordeiro@xxxxxxxxxxxxxxx>]

I keep receiving this error in my /var/log/mailog

sendmail[10209]: NOQUEUE: localhost [127.0.0.1] did not issue
MAIL/EXPN/VRFY/ETRN during connection to MTA

I checked Sendmail.org and found this:

Subject: Q4.18 -- What does "NOQUEUE: Null connection from ..." mean?
Date: February 24, 2000
Updated: March 12, 2000
An entry like:

NOQUEUE: Null connection from host.domain [IP.AD.DD.RESS]

in the logfile means that host.domain connected to your MTA but neither
initiated transmission of a message (by issuing the MAIL command), nor used
any of the commands that are logged separately (EXPN/VRFY/ETRN). Unless this
happens very often, you can ignore this. If it happens very often, it's
either someone playing around or it's a network problem.
Note 1: The significant part of the message isn't the NOQUEUE, but the "Null
connection from ...". In particular, NOQUEUE isn't an error indication, but
just a "place-holder" when no queue ID has been assigned, typically because
message collection hasn't started (yet). It can occur in other messages too,
and there too the significant part is what comes after the NOQUEUE.

Note 2: In 8.10, the text which led to the confusion has been changed to:
"... did not issue MAIL/EXPN/VRFY/ETRN during connection to ...".

End

I'm get this every 15 minutes. I know its not a hacker according to the last
line of that doc. So My question is WHAT are the Network Problems that would
cause this. A DNS(MX) record.????

Any Help
John Cordeiro