WCSAP
Wildcat! Sender Authorization Protocol
(c) copyright 2003-2019 Santronics Software,Inc.
Santronics Software, Inc (SSI), with its continued efforts to combat electronic
mail abuse also known as "spam," offers a suite of advanced anti-spam
technologies and methods called WCSAP, Wildcat! Sender
Authorization Protocol.
How it works:
In the SMTP email world, it works because the final destination (the
recipient) receiver system do not required authentication. The
connecting client need only anonymous access.
Authentication is only required when a route or relay is required. If
this was not possible and authentication was always required, the email
system would break down with no one receiving unsolicated mail.
Typical Flow
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Figure 1.0 illustrates the basic SMTP protocol state machine.
When a mail client attempts to send mail to your system, it connects
to the wcSMTP server and then issues five SMTP commands starting
with HELO (or EHLO) to begin a session ending with the QUIT command to close
the session.
In wcSMTP, a validation of the input is done at each state from
HELO/EHLO to DATA. A client can not reach the next state
unless it passes the current state.
WCSAP is designed to validate each state upto the DATA state.
If a client passes all the checks WCSAP performed, then the DATA is transferred.
SMTPFILTER is activated at DATA to analyze the transferred
email to finally issue a DATA reception response.
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