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Spam Filter
Anti-Spam Features of Imail 8
The impact spam has is enormous: it takes time to delete; is a
distraction from reading important email; takes up network resources to
store the email messages and bandwidth to receive, deliver and bounce
messages; and it can be offensive.
Connection Filtering
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Real-time Blackhole Lists (RBL)
lists third party services that include domain names and IP
addresses of known spammers; Comes with 5 free RBL lists by default
and can be configured with additional ones by the administrator like
ORDB or MAPS.
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Verify the MAIL FROM validates that
the MAIL FROM address actually exists.
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| Perform Reverse DNS Lookup
verifies the DNS record
for the sending servers IP address.
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| Verify the EHLO/HELO domain
validates that the sending mail server
domain exists in DNS.
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| Kill Lists (block by
domain or email address)
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Trusted IP Addresses |
Content Filtering
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Bayesian statistical filters use spam’s characteristics against
itself. Words are analyzed based on how frequently they appear in good
email versus bad email. Then the message is assigned a probability of
being spam.
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| Phrase Filtering
searches for phrases in the body of the messages.
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Trusted IP Addresses & White Lists of trusted e-mail or IP
addresses that will allow messages through, minimizing false
positives. |
Delivery Rules
New outbound rules capability helps
administrators eliminate obscene language and stop confidential
information from going out. Combination rules help prevent viruses from
entering the network and they cut down on spam. And you can also reduce
spam by disallowing the creation of subfolders that are often byproducts
of spam
Delete and prevent junk e-mail, route important
messages based on headers and contents, and/or stop hostile e-mail
viruses
Too much mail all in
your Inbox?
IMail's delivery rules let you sort mail
into different mailboxes or just delete it, based on its headers or
contents. Delivery rules include:
| Scan the message Header (To, From, Sender, Subject)
or the body text |
| "Contains" and "Does Not Contain" logic
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| Deliver mail to existing or new mailboxes, or
delete it |
| Pattern matching with regular expressions for
finding near matches or matching more than one string |
| Finding specific file types, such as the .vbs files
associated with the "lovebug" viruses |
| Eliminate obscene language |
| Stop confidential information from going out and
viruses from spreading |
| Provides the ability to limit e-mail usage.
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IMail Server has the ability to apply delivery rules
for a particular host or for individual users. For example, you could
create a file of spam-filtering rules and apply it at the host level,
and users could also create their own personal rules. Here are some
examples:
| If FROM doesn't contain "@ipswitch.com" move
message to "LowPriority" mailbox |
| If SUBJECT contains "get rich quick" delete message
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| if BODY contains "(wsftp|ws_ftp)" move message to "WS_FTP"
mailbox |
Check out the IMail delivery rule that
stops .vbs
viruses like "Lovebug I & II".
click to enlarge |
Apply delivery rules at three
levels: for the entire server, a particular host, or for
individual users |
Relay
Prevention
Spammers want to hijack your company's mail
server to launch their junk mail - at your expense - often making you
look like the source of their spam. Now you can curb e-mail abuse before
it wastes your valuable time and network resources. IMail uses the
latest technology to block
unsolicited mail and
prevents your system from being used as a relay by junk mailers.
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