The remote host is missing an update to masqmail announced via advisory DSA 194-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20194-1

A set of buffer overflows have been discovered in masqmail, a mail transport agent for hosts without permanent internet connection. In addition to this privileges were dropped only after reading a user supplied configuration file. Together this could be exploited to gain unauthorized root access to the machine on which masqmail is installed. These problems have been fixed in version 0.1.16-2.1 for the current stable distribution (woody) and in version 0.2.15-1 for the unstable distribution (sid). The old stable distribution (potato) is not affected since it doesn't contain a masqmail package. We recommend that you upgrade your masqmail package immediately.