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Smtpblock - Automatically detects and blocks open mail relays

'Smtpblock' parses a *nix mail log. When new mail messages are detected, it performs DNSBL/SMTP relay tests. If the host is listed in a DNSBL or relays third-party mail, Smtpblock creates a firewall rule to block access to the localhost's SMTP port and/or creates a hash that can be referenced by sendmail's RFC-822 pattern matching feature.

It keeps track of each host's test status and time when it will need to be rechecked, reducing the need to constantly check every host sending mail to the local system. Smtpblock can be run as a daemon continuously checking the mail log or as a standalone program parsing the entire log file. Hosts can be manually checked, blocked, or unblocked from the command line.



Obtaining

Web pagehttp://www.angmar.com/smtpblock/
Source tarballhttp://www.angmar.com/smtpblock/smtpblock-2.8.tgz
Source informationhttp://www.angmar.com/smtpblock/download.html
Version 2.8 (stable) released on 2002-12-26
Licensed under a 3-clause BSD-style license.
This is not a GNU package.

Documentation
User manpage available in HTML format from http://www.angmar.com/smtpblock/smtpblock_2.8_man_page.html
Support contacts

Announce List<smtpblock-announce@angmar.com> http://www.angmar.com/mailman/listinfo/smtpblock-announce
Help List<smtpblock-users@angmar.com> http://www.angmar.com/mailman/listinfo/smtpblock-users
Developer List<smtpblock-developers@angmar.com> http://www.angmar.com/mailman/listinfo/smtpblock-developers

Project contacts

Maintainers
Developers

Related information

Interfacesdaemon, command line
Source languagesPerl
Use requirementsPerl 5.002 or later, NMAP, sendmail, Net::Netmask

Entry information

License verified byJanet Casey <jcasey@gnu.org> on 2002-08-22
Entry compiled byJanet Casey <jcasey@gnu.org>

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Copyright © 2000, 2001, 2002, 2003 Free Software Foundation, Inc.

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