Rit Research Labs The Bat! 1.51 for Windows allows a remote attacker to cause a denial of service by sending an email to a user's account containing a carriage return <CR> that is not followed by a line feed <LF>.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6423
http://www.securityfocus.com/bid/2636
http://archives.neohapsis.com/archives/bugtraq/2001-04/0410.html
http://archives.neohapsis.com/archives/bugtraq/2001-04/0381.html