Other products query the DNS-based blacklist servers only at the SMTP
protocol level. Thus these products must be able to
receive the message directly from the transmitting mail host so the
connected IP address may be used in the query. As a result, the best these
products can do is log the blacklisted IP address.
Praetor's protection goes beyond this. By default,
Praetor adds and enables a message level DNS blacklist check. This
approach gives two distinct advantages over using just a protocol level test:
Praetor can correctly identify the connected IP address of the external mail host even when
situated downstream from the message point of entry.
Praetor records more information than just the IP address,
adding the sender, recipient and subject.
As a result, communications from blacklisted partners are quickly
identified, and, as shown below, their IP address can be added to Praetor’s bypass list.