Postgrey
Postgrey is a Postfix policy server implementing greylisting.
When a request for delivery of a mail is received by Postfix
via SMTP, the
triplet CLIENT_IP / SENDER
/ RECIPIENT is built.
If it is the first time that this triplet is seen, or if the triplet
was first
seen, less than 5 minutes ago, then the mail gets rejected with a
temporary
error.
(Greylisting is a method of blocking significant
amounts of spam at the mailserver level, but without resorting to
heavyweight statistical analysis or other heuristical (and error-prone)
approaches. Consequently, implementations are fairly lightweight, and
may even decrease network
traffic and processor load on your mailserver).
Postgrey 1.34
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Price
Free to download
Size
35KB
License
GNU GPL v2
Developer
Open Systems AG
Website
postgrey.schweikert.ch
System Requirements
Perl ≥ 5.6.0
Net::Server
IO::Multiplex
BerkeleyDB (Perl module)
Berkeley DB (library ≥ 4.1)
Support
Sites:
Mailing
List, Tutorial
Selected
Reviews:
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Features include:
- Safe database
- Automatic maintenance
- Lookup by subnet
- Whitelists
- Auto-whitelisting of clients
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to Email Home Page
Last Updated Sunday, November 25 2012 @ 12:53 PM EST
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