Summary
The remote host is missing an update as announced
via advisory SSA:2003-260-02.
Solution
https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2003-260-02
Insight
The sendmail packages in Slackware 8.1, 9.0, and -current have been patched to fix security problems. These issues seem to be remotely exploitable, so all sites running sendmail should upgrade right away.
Sendmail's 8.12.10 announcement may be found here:
http://www.sendmail.org/8.12.10.html