Buffer overflow in Eudora for Windows 5.2.1, 6.0.3, and 6.1 allows remote attackers to execute arbitrary code via an e-mail with (1) a link to a long URL to the C drive or (2) a long attachment name.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16086
http://www.eudora.com/download/eudora/windows/6.1.1/RelNotes.txt
http://secunia.com/advisories/11568
http://marc.info/?l=bugtraq&m=108395487628044&w=2
http://lists.netsys.com/pipermail/full-disclosure/2004-May/021059.html