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MailShield is fully Internet-based spam protection service, needing no installation of
software or hardware at your premises. All the work is done in-line -
before email reaches your network inbound, and immediately after it
leaves your network outbound. To enable the
use of MailShield for your business, a simple change is needed to your
domain MX records
Once these DNS changes have been
applied, mail will enter the MailShield system before entering your
network. Each inbound email is scanned in an instant in the following
ways:Stage 1 - Multiple anti-virus engines
Email
passes through MailShield's commercial McAfee, F-Prot, Bitdefender and
Sophos anti-virus engines in an instant, together idenotifying if an
email contains a known virus or vulnerability. If a match is found, the
email will be deleted and information logged about the virus or
vulnerability identified for user review.
MailShield's anti-virus engines are updated every 30 minutes day and night to provide the very best protection for your business.
Stage 2 - Spam filtering - up to 145 tests in an instant
Spam
filtering is definitely not for the faint hearted - a method of
catching spam today may not work tomorrow. MailShield constantly
evolves and adapts to catch the latest spam threats by applying a
point-scoring system to each email scanned.
Up to 145 intelligent tests
are carried out in a few seconds - these tests range from
reverse DNS checking, to hyper-accurate advanced pattern matching and
artificial intelligence technologies. Each positive test earns a number
of points - these points accumulate into a spam result score - often
between -10 and 70, sometimes beyond 100. In a normal set-up, all
emails surpassing a score of 4 would be held as spam.
This
method of point-scoring provides increased protection against false
positives - in some cases emails innocently fail tests, however pass
most others. Spam, however, would fail many more tests and the result
would be an increased spam score.
Stage 3 - Intelligent secure archiving
Once
the spam and virus tests have been performed, intelligent secure
archiving can take place. At this stage, the
mail remaining is classed as 'clean' and a copy is made available to
the intelligent archiving system.
All email
copies queued for archiving will be encrypted using 128bit technology
and sent into the archives - these being the MailShield Central
Archive, or a larger-scale dedicated archive server. You can even
choose to have a copy of these emails delivered securely back to your
site.
Your emails pass through stage 1, 2 and
3 in less than 4 seconds. After that, MailShield re-delivers your mail
to your designated mail server as before, only this time cleaned and
archived. |
