GTA's Anti-Spam option offers customizable spam blocking for GTA's
firewall email proxy. Simply utilize the email proxy on your GTA firewall
for your SMTP email, and activate the Anti-Spam subscription - no software
to download and install.
The Anti-Spam greylisting settings offer enhanced email filtering before
the email reaches the email server. Greylisting is designed to protect
users from spammers that use fire and forget email applications, which
are created to send spam messages, but never attempt to retry delivery
if the first attempt fails. Greylisting significantly reduces the number
of emails which are scanned by spam rules, so email processing is more
efficient. With a two pronged attack on email, spam is virtually eliminated
while legitimate email is efficiently processed and received at the
GTA's Anti-Spam option uses technology that reviews each message in fractions of
seconds by a spam identification engine utilizing more multiple
algorithms and rules to identify spam with a high accuracy rate while
preventing false positives. Mechanisms used include text and header analysis, Bayesian filtering,
DNS blocklists, and collaborative filtering databases to calculate one
final spam probability score. The Anti-Spam subscription option
automatically check for rules updates to ensure the accurate weighting
against the most up-to-date rules for formulation of the spam probability
SpamScore rankings range from 0-100 and are utilized by the Anti-Spam
subscription to rank emails as spam (confirmed) or probable (suspect).
Firewall administrators can establish thresholds based on SpamScore for
confirmed and probable spam to fine tune the control of the spam filtering
to match corporate needs. Once Anti-Spam thresholds have been established,
administrators may choose to accept, reject, tag or quarantine confirmed or
suspected spam emails.
When used in conjunction with the Mail Proxy's basic features, a corporation
can virtually eliminate spam emails delivered via the firewall email proxy.