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source: http://www.securityfocus.com/bid/15556/info MailEnable is prone to a remote denial of service vulnerability. The vulnerability presents itself when a user issues a malicious rename request following authentication. Remote attackers can exploit this issue to trigger a denial of service condition. telnet localhost 143 a1 login josh byebye a2 rename foo bar where josh and byebye are the login credentials for an existing mailbox.