This host is installed Maildrop and is prone to Privilege Escalation vulnerability
Successful exploitation will allow local users to gain elevated privileges. Impact Level: Application.
Upgrade to Maildrop version 2.4.0 For updates refer to http://sourceforge.net/projects/courier/files/
The flaw is due to the error in the 'maildrop/main.C', when run by root with the '-d' option, uses the gid of root for execution of the mailfilter file in a user's home directory.
Maildrop version 2.3.0 and prior.