The remote host is missing an update as announced via advisory SSA:2006-081-01.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2006-081-01

New sendmail packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, 10.2, and -current to fix a security issue. Sendmail's advisory concerning this issue may be found here: http://www.sendmail.com/company/advisory/index.shtml This issue will appear in the Common Vulnerabilities and Exposures (CVE) database at the following location: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0058