The remote host is missing an update to libmailtools-perl announced via advisory DSA 386-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20386-1

The SuSE security team discovered during an audit that the Mail::Mailer module, a Perl module used for sending email, whereby potentially untrusted input is passed to a program such as mailx, which may interpret certain escape sequences as commands to be executed. This bug has been fixed by removing support for programs such as mailx as a transport for sending mail. Instead, alternative mechanisms are used. For the stable distribution (woody) this problem has been fixed in version 1.44-1woody1. For the unstable distribution (sid) this problem will be fixed soon. We recommend that you update your libmailtools-perl package.