Error when MailScanner calls Sendmail

[Dan Bowen]

I'm getting a note in the log from the MailScanner called sendmail
process, as follows, though it doesn't affect performance, it just
started appearing last friday morning:

Feb 24 23:07:50 mail sendmailMTA[22307]: h1P47nRN022307:
from=<xxxxxxxx at ntown.com>, size=18234, class=0, nrcpts=1,
msgid=<000001c2dc82$31c44240$848941cf at default>, proto=ESMTP,
daemon=MTA, relay=root at ntown.esper.com [216.111.16.26]
Feb 24 23:07:50 mail MailScanner[18194]: New Batch: Scanning 1
messages, 18701 bytes
Feb 24 23:07:51 mail MailScanner[18194]: Spam Checks: Starting
Feb 24 23:07:56 mail MailScanner[18194]: Virus and Content Scanning:
Starting
Feb 24 23:07:56 mail MailScanner[18194]: Uninfected: Delivered 1
messages
Feb 24 23:07:56 mail sendmail[22316]: gethostbyaddr(66.4.192.160)
failed: 3    #<------- THIS IS THE ERROR
Feb 24 23:07:58 mail sendmail[22318]: h1P47nRN022307:
to=<xxxxx at ortn.edu>, delay=00:00:08, xdelay=00:00:02, mailer=local,
pri=121098, dsn=2.0.0, stat=Sent


I can't figure out where I could find a config reference for this.  The
IP address given is of the mailserver that is running the programs.
Anyone else ever see this?