Unrecognized escape error in shares.pl

I've searched the archive and not found anything about this.
 
Every five minutes, the root account on this system gets another copy of
the mail below.  I've triple-chekced and the bb4 user does NOT have any
cron jobs.  Despite the name we are running Hobbit and not BB.
 
Does anyone have any idea what the problem might be?  This tends to fill
up the mail spool...
 
From: user-3ef3bcd99a11@xymon.invalid <mailto:user-3ef3bcd99a11@xymon.invalid>  (Cron Daemon)
To: <mailto:root at m> root@ <mailto:user-3ef3bcd99a11@xymon.invalid> hostname.fqdn
Subject: Cron <mailto:bb4 at v> bb4@ <mailto:bb4 at hostname> hostname
/bb4/bb/server/ext/shares.pl
X-Cron-Env: <SHELL=/bin/bash>
X-Cron-Env: <PATH=/sbin:/bin:/usr/sbin:/usr/bin>
X-Cron-Env: <MAILTO=root>
X-Cron-Env: <HOME=/>
X-Cron-Env: <LOGNAME=bb4>
 
Unrecognized escape \w passed through at /bb4/bb/server/ext/shares.pl
line 84.
 
 
---
Doug Linder
UNIX Systems Administrator
CompuCom Systems, Inc.
 
SABIC Innovative Plastics
T: XXX XXX XXXX
D: *838 7563
E: user-c834f078a0a6@xymon.invalid