| amavisd-milter | sendmail milter for amavisd-new |
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| amavisd-new | High-performance interface between the MTA and content checkers |
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| bmf | Fast and small Bayesian spam filter |
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| bogofilter | Bayesian spam filter designed with fast algorithms, and tuned for speed |
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| courier-pythonfilter | Python filtering architecture for the Courier MTA |
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| couriersrs | SRS (Sender Rewriting Scheme) wrapper for the courier MTA |
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| dcc | Distributed Checksum Clearinghouse |
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| dkimproxy | An SMTP proxy server for adding DKIM headers |
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| exim-geoip | This is an IPv4 and IPv6 capable GeoIP dlfunc library for Exim |
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| exim-p0f | This is p0f version 3 dlfunc library for Exim |
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| gld | Standalone anti-spam greylisting algorithm on top of Postfix |
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| imapfilter | An IMAP mail filtering utility |
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| libmilter | The Sendmail Filter API (Milter) |
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| libopensmtpd | Library for creating OpenSMTPD filters |
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| libsieve | A library for parsing, sorting and filtering your mail |
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| libspf2 | implementation of Sender Policy Framework (SPF) |
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| libsrs2 | libsrs2 is the next generation Sender Rewriting Scheme library |
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| maildrop | Mail delivery agent/filter |
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| mailfilter | Mailfilter is a utility to get rid of unwanted spam mails |
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| MailScanner | Free Anti-Virus and Anti-Spam Filter |
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| mapson | A challenge/response-based white-list spam filter |
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| milter-regex | A milter-based regular expression filter |
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| mimedefang | Antispam, antivirus and other customizable filters for MTAs with Milter support |
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| normalizemime | Helper program to normalize MIME encoded messages |
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| opendkim | A milter providing DKIM signing and verification |
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| opendmarc | Open source DMARC implementation |
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| opensmtpd-filter-dkimsign | OpenSMTPD filter for signing mail with DKIM |
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| opensmtpd-filter-rspamd | OpenSMTPD filter for putting emails through rspamd |
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| policyd | Policy daemon for postfix and other MTAs |
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| policyd-weight | Weighted Policy daemon for Postfix |
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| popfile | Anti-spam bayesian filter |
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| postforward | Postfix Sender Rewriting Scheme forwarding agent |
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| postfwd | Versatile Postfix policy server with a flexible ruleset based configuration |
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| postgrey | Postgrey is a Postfix policy server implementing greylisting |
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| postsrsd | Postfix Sender Rewriting Scheme daemon |
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| procmail | Mail delivery agent/filter |
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| pyzor | A distributed, collaborative spam detection and filtering network |
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| razor | Distributed, collaborative spam detection and filtering network |
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| rblcheck | Perform lookups in RBL-styles services |
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| rspamd | Rapid spam filtering system |
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| scmail | a mail filter written in Scheme |
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| sieve-connect | Sieve Command Line Interface |
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| spamassassin | An extensible mail filter which can identify and tag spam |
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| spamassassin-botnet | SpamAssassin plugin that attempts to detect messages sent by a botnet |
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| spampd | A program to scan messages for Unsolicited Commercial E-mail content |
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| spamprobe | Fast, intelligent, automatic spam detector using Bayesian analysis |
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| spf-engine | Policy daemon for Postfix SPF verification |
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| sqlgrey | A postfix policy service implementing a grey-listing policy |
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| zdkimfilter | DKIM filter for Courier-MTA |
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