If you'll be running JSpamFilter on the same machine as the mail server, change the mail server to listen on port 26. Notes on changing the "listen"
port on various mail servers can be found here.
||These parameters are arguably the most fundamental parameters controlling JSpamFilter's communications
with the mail server.
The port you want to listen on. The default is 25.
The IP address you want to listen on. Options are "all" (listen on
all available IP addresses), or a single IP or hostname to listen on. The default
The port you want to send validated connections to. The default is 26.
The IP address you want to send validated connections to. If "all",
JSpamFilter will connect to the same IP that the inbound connection had connected
to. The default is "all".
NOTE: If "all" is specified, or if the ListenIP and TalkIP are identical,
then the ListenPort and TalkPort must be different.
Otherwise JSpamFilter will wind up "talking to itself" in a feedback loop.