Offering a safe, secure and conveniently located
facility to support a wide variety of mission-critical
web based, medical, financial, ASP, and other applications.
Our dual scanning virus protection scans all inbound and
outbound emails using a multi-stage, dual scanner process.
The process is broken down into the following four stages:
Stage 1: Restricted Attachments Here, emails are
scanned for dangerous types of file attachments. When an email is sent or
received that contains a restricted file attachment, the email is rejected and
the sender receives a "bounced" email notification informing them of the
restriction.
Stage 2: Normalization This stage searches for email
formatting vulnerabilities that can be used by viruses to hide from virus
scanners. If any vulnerability is found, our system corrects the formatting of
the message so that it can be thoroughly scanned for viruses.
Stage 3: Decompression Next, if the email contains any
compressed attachments such as zip files, the compressed attachments are
temporarily unzipped so that the contents can be scanned for viruses.
Stage 4: The Dual Virus Scan After the above
preprocessing is complete, two separate virus scanners are used to scan the
email and all of its uncompressed attachments. Everything is scanned twice to
ensure maximum protection against new virus threats. ClamAV (www.clamav.net) and
F-Prot (www.f-prot.com) are the current scanners of choice, although our system
was designed to be able to plug-in any virus scanner on the market, should the
need to do so arise.
Stage 1: Restricted Attachments 
