MailMarshal is powered by a multilayered anti-spam engine
which provides a consistent 99.5% spam catch rate with <0.001%
instances of false positives.
Each layer in the MailMarshal Anti-Spam Engine is designed to
work in sequence to gain the optimum mix of spam detection,
accuracy, performance and management for business networks.
- IP Reputation Services and RBLs –
this layer is
designed to reject as much as 65%-75% of spam before it reaches
your organization’s gateway, using blacklists of known spam IP
addresses. It also employs MailMarshal’s innovative Automatic
Adaptive IP Whitelists. This feature intelligently builds lists
of IP addresses that your organization regularly communicates
with, to ensure that your customers and partners do not have
email rejected if they should become mistakenly blacklisted by a
Reputation service.
- SpamProfiler – this layer uses spam signature
(fingerprint) pattern matching to quickly and accurately
identify a further 25% of spam. SpamProfiler receives updates
from Marshal every few minutes. At this layer, as much as 90% of
spam has already been rejected or deleted with a near zero false
positive rate and virtually no latency.
- SpamCensor – this is MailMarshal’s proprietary
heuristic spam filter which employs thousands of spam checks to
score messages which have been allowed to pass the previous
layers. SpamCensor specializes in detecting new types of spam
that have not been encountered before. At this layer, SpamCensor
detects a further 8%-10% of spam, bringing the overall detection
rate up to approximately 98%. This incremental amount of spam
can be deleted or quarantined, allowing end users to quickly
check that an unlikely false positive has not occurred.
- Real-time Blacklists (RBLs) and URLCensor –
this
layer examines URL links embedded in messages and performs DNS
lookups against lists of known websites associated with spam.
This layer boosts spam detection to 99.5% as standard, without
any special tuning or customization on your part. Once the
MailMarshal anti-spam engine has been synchronized with the
latest updates from Marshal, you can expect to receive less than
0.5% of the spam you normally would.
- Custom Policies – if you wish, you can define some
unique preferences to customize your spam filtering settings.
For example, you can use CountryCensor to reject messages from
specific countries or you can enable personalized whitelists for
end users, so that they can exempt specific email addresses from
spam filtering just for them.
Learn More
Anti-Spam Technology
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