Hermes is an SMTP proxy. We developed hermes for our own use on ITEISA, and we have perfected
it with new features to cover our own needs. It is now being made public on the hope that it
will help others to stop spam the same way it does for us everyday.

What makes it special is that it can be used to stop spam using a combination of the following
techniques:

SMTP banner delay
Most spammers will start sending data as soon as the connection is open, without waiting for the
SMTP banner. What we do is delay this banner and if we have data waiting before we print it, we
drop the connection.

Throttling
hermes will process incoming SMTP commands at a slow pace. Most spammers have very little patience,
so they will stop sending an email if it's taking too long to deliver.

Greylisting
Greylisting is a process that will delay incoming mails for some minutes before allowing them to
be delivered. As most spammers will not resend their messages, you will not receive them. If you
want a more technical description, scroll down to read a greylisting description.

DNSBL
As of hermes 1.2 you can now configure hermes to reject emails coming from ips listed on your
favourite DNSBL, using the rbl_domain option.

Binaries
Latest Hermes build for OS/2 is version 1.6.

Additional requirements:

    * libc 0.6.3 runtime