Smtpblock

'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.

Last updated 5 May, 2005


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BSD_3Clause

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About

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Requirements
  • Perl 5.002 or later (Use Requirement)
  • NMAP (Use Requirement)
  • sendmail (Use Requirement)
  • Net::Netmask (Use Requirement)
Related Projects

libsmtp

Versions

2.8

2.8 stable released 2002-12-26

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

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Please send comments on these web pages to bug-directory@fsf.org, send other questions to info@fsf.org.

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