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Below we describe some of the techniques Stealth Spam Protection employs to defend against mail abuse.

MAPS, "Mail Abuse Prevention System", is a group of 3 databases at that contains Internet addresses that can be used to reject mail. The 3 databases are:

  • Black holes is a database of known sources of SPAM that repeatedly send out SPAM and have been the target of complaints.

  • Relays ("RSS" relay spam stopper) is a database of mail servers that indiscriminately accept mail from any other mail server and forward the mail to any other mail server. This process is called "open mail relaying". Spammers hijack open relay servers to deliver spam since the spammer can obscure himself behind the open relay as the real source of the spam. The operator of the open relay mail server is then implicated in the mail abuse as well as having his mail server inundated by tons of SPAM traffic, and the complaints.

  • Dial-ups ("DUL") is a database of world-wide Internet addresses reserved for accessing Internet by dial-up users. Recently, the Internet addresses of DSL telephone subscribers and Internet TV cable subscribers have also been added to this DUL database. Normally, dial-up users should send their outgoing mail to their ISP's mail server for forwarding to Internet. But mail abusers on DUL addresses bypass their ISP mail server and send spam directly to open relay servers and any other mail server.

In the above diagram, Stealth queries the MAPS database for the presence of the Internet address of the sender's mail server. If the address is in MAPS, the email is rejected.

Implementation of Stealth Anti-Virus & Spam Protection is technically very simple and without disruption to a client's normal mail operations.

  • A client implements Stealth simply by modifying the client's DNS MX ("mail exchanger") records to route the client's mail traffic to ITS Group Information Technology first rather than to the client's mail server.
  • Note that in fact ITS Group Information Technology provides two identical Stealth servers, a primary and a secondary, for redundancy. If the primary Stealth is unavailable, the secondary Stealth will accept the mail.
  • ITS Group Information Technology's Stealth receives the incoming mail from Internet, performs mail abuse validations, and forwards the accepted mail directly to the client's mail server. The delay through Stealth is typically only a few seconds for a message with an average size of 20 kilobytes.
  • In the case where the client's mail server is temporarily unavailable, Stealth will hold the client's mail until the client's mail server become available again.
  • Clients whose mail servers are not continuously connected to Internet can use Stealth both for its defenses and for its mail relay features. The client's off-line mail server connects to Internet temporarily to exchange incoming and outgoing mail with Stealth. After the client's mail server goes off-line, Stealth scans the outgoing mail and delivers it to the final Internet destinations.

Give our sales team a call today 1-780-701-7282 or e-mail Sales.

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  The Cost of Virus Attacks

Email is the source of 83% of all virus infections.
The risk of a virus infection has risen 15% per year for the past two years.
The average server downtime per virus infection is 14 hours.
It takes an average of 4 person-days to recover from a virus infection.
The average direct cost per virus infection is US$5,500.

- 7th Annual Virus Prevalence Survey, ICSA Labs

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