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NPOShield provides email security for your organization. By receiving all
mail for your domain, filtering out the bad stuff, and passing the cleaner
mail on to you, we provide a shield for email against hackers and
spammers. You keep on using your existing mail system, only without all
the spam and viruses!
- We scan your messages for spam
characteristics using a combination of greylisting, Bayesian statistical
methods, header and body pattern matching, DNS realtime blacklists,
optical character recognition, and reports from humans and mail servers
who have seen copies of your spam messages before. Most spam is blocked
right at the front door for not behaving like standard Internet email.
Definite, unambiguous spam is deleted. The remaining probable spam is
tagged with [SPAM] in the subject line and delivered to your
server, where you can set up automatic filtering server-wide or per-user.
For every 1000 incoming spams, we estimate that 937 are blocked, 52 deleted,
and 10 tagged, leaving 1 message which ends up in your inbox.
NPOShield's false-positive
rate (real mail tagged as spam) is far less than 0.1%, virtually all of
which is commercial mail or spam-like newsletters.
- We scan your messages for viruses and clean them before the messages ever
reach your mail server or your users's computers, providing an extra layer
of virus protection. If viruses are found, the viral attachments are
quarantined and the message is tagged with [VIRUS] in the subject.
Only the clean message is delivered to your server, where it can be
accessed by the recipient just like normal.
- In cases where email becomes abusive or
intrusive, we can easily and quickly block messages from
selected senders or servers or to selected
recipients
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Without NPOShield: users recieve spam,
viruses, abusive mail and ordinary non-malicious mail directly at your
mail server. |
With NPOShield: spam is tagged, viruses
cleaned, and abuse blocked before the mail ever reaches your organization.
Ordinary mail gets through untouched. |
As an added benefit, using NPOShield also introduces healthy redundancy into your email system:
When your mail server or its Internet access stops working, NPOShield
receives your mail and queues it until your server comes back up and is
ready to receive messages again.
For details see the NPOShield Users Guide or
NPOShield Administrators Guide.
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