MDaemon is now able to generate hashcash stamps. Hashcash is a form
of electronic postage designed to help verify that the sender of an
email message invested sufficient effort in order to do so. Effort is
measured in terms of CPU use. Now that hashcash verification is support
system and inserted into outgoing messages will have a real impact on
lowering the false positive rates when your users send mail. A new
screen was added to the Spam Filter properties to configure hashcash
settings.
In order to stamps to be generated and inserted into
messages the message must have arrived to MDaemon over an authenticated
SMTP session. Stamps are never generated for list messages. Finally,
only messages either FROM or TO an address listed in HCMint.dat will be
stamped. You can configure all this from within the Hashcash properties
in the GUI.
In order to honor hashcash stamps for incoming
messages your domains must be listed in the
\SpamAssassin\Rules\80_MDaemon_Hashcash.cf file. The installer has
already enabled all users of your primary domain for this. To see how it
is done for other domains just open the file with notepad and read the
instructions there.
For more information on HashCash and to support the HashCash concept visit http://www.hashcash.org/.
Additional Comments
This feature requires MDaemon Pro.