FirstClass Internet Services server 5.770, and other versions before 6.1, allows remote attackers to cause a denial of service by sending an email with a long To: mail header.Referenceshttps://exchange.xforce.ibmcloud.com/vulnerabilities/4843http://www.securityfocus.com/bid/1421http://www.osvdb.org/5718http://archives.neohapsis.com/archives/bugtraq/2000-06/0295.html
