Postfilter 0.7.1 review

Postfilter is a perl filter for Internet Net News (innd) which checks all messages sent by local users searching for spam and invalid

License: BSD License File size: 42K Developer: Postfilter Team

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Postfilter is a perl filter for Internet Net News (innd) which checks all messages sent by local users searching for spam and invalid contents.

Although Postfilter is designed for large sites that need a complex tool, Postfilter could by used also by local or private servers.

Here are some key features of "Postfilter":
A powerful banlist: rules can be based on every header and each article could be rejected, silently discarded, tracked throught syslog or saved for further inspection
A content-based filter. A score could be assigned to every regex; when the body matches an expression, the assigned score is added to the total. If an article exceeds the maximum allowed score, it's rejected by the script.
A fine regulation of clients' activity. Postfilter allows to set a max number of articles, bytes, groups, followups, crossposts, hierarchies and errors per time. A second shorter interval is also setable to avoid floods. All these rules can be applied to IP, domain (level n-1) or userid.
Several built-in syntax checks that scans the headers searching for errors commonly made by spammers.
A white list that allows to exclude from the check every article that matches a regular expression or every article that includes a predefined header.

Postfilter is released under the terms of BSD License.

Requirements:
INN >= 2.4.0 compiled with perl support (--with-perl)
Perl >= 5.6.0
The following perl modules:
Date::Parse
Sys::Syslog
Digest::MD5

What's New in This Release:
A MySQL storage backend was added, so now the spool can be handled through a MySQL server.
A "state" command was added, which allows you to close or disable the filter.
A forbidden crosspost rule was added, which allows you to forbid crossposting among groups.
Now it's possible to avoid the filter to run innconfval (which is useful for large sites).
The errors are now handled in a clearer form.