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As soon as a connection request is received, Alligate gets to work and attempts to identify the intent of the sender. Alligate performs
various checks and throws various roadblocks into the process at each step in the SMTP transaction. We give the spammer every
opportunity to go away on their own, and go away quickly. Years of study and experience in this area enables us to identify spammer
tactics and actually use their own tactics against them.
MXRate - All connections are checked against our proprietary
sender reputation database. Depending on the senders
reputation, they might be blacklisted, greylisted, or tarpitted for a
number of seconds. The MXRate score is also used add negative
or positive points to the message for later evaluation.
Greylisting - This is an extremely effective way to discourage
automated spammers. While several other products have
implemented Greylisting as a spam defense, only Alligate lets you
specify rules that are used to determine when to enforce
DNS Blacklists and Reverse DNS Lookups - Each connection is
subject to additional tests to try to determine the senders
legitimacy factor. The results of these checks can add additional
tarpit seconds, or can help us determine whether or not we want
to subject the sender to Greylisting.
Tarpitting - Alligate uses an extremely effective proprietary form of
tarpitting to “discourage” spammers and attempt to get them to
disconnect on their own. Unlike other implementations, Alligate
uses tarpitting in a totally dynamic way. Depending on the message
and sender, tarpitting delays can be inserted at any point in the
SMTP conversation and for varying amounts of time. This means
that it will be unlikely that legitimate senders will ever be affected
negatively, while still imposing tarpit delays where they are most
Command Analysis - Alligate analyzes the content and structure
of every command received from a sender. Unusual formatting or
improper structure are flagged and used in the overall analysis.
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