The remote host is vulnerable to a Denial of Service (DoS) attack.
A buffer overflow vulnerability has been reported for MDaemon. The vulnerability is due to inadequate bounds checking one some POP server commands. An attacker can exploit this vulnerability by submitting a very large integer value to some commands on the POP server. This will cause the MDaemon service to crash when attempting to process the command.
Upgrade to MDaemon 6.5.0 or higher.