The remote host is missing an update to fetchmail announced via advisory DSA 1377-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201377-1

Matthias Andree discovered that fetchmail, an SSL enabled POP3, APOP and IMAP mail gatherer/forwarder, can under certain circumstances attempt to dereference a NULL pointer and crash. For the stable distribution (etch), this problem has been fixed in version 6.3.6-1etch1. For the old stable distribution (sarge), this problem was not present. For the unstable distribution (sid), this problem will be fixed soon. We recommend that you upgrade your fetchmail package.