Eudora 6.1.0.6 allows remote attackers to obfuscate URLs displayed in the status bar by inserting a large number of characters (e.g. spaces coded as " ") in the middle of the URL.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16105
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-2640
http://www.securityfocus.com/bid/10305
http://www.eudora.com/download/eudora/windows/6.1.2/RelNotes.txt
http://securitytracker.com/alerts/2004/May/1010117.html
http://secunia.com/advisories/11581
http://archives.neohapsis.com/archives/bugtraq/2004-05/0066.html