Synchronet v3.16c-Win32 (install) has been released (Aug-2015).

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Use SpamAssassin with the Synchronet Mail Server

The Synchronet SMTP Server may use a SpamAssassin server (spamd) to rate received messages and tag or even reject them based on the results.

Installation

When installing SpamAssassin, make sure you enable the spamd (daemon).

Windows

Apparently, it is possible to run spamd on Windows, but *nix OSes are much preferred.

Linux

On some Linux distributions, you may enable the SpamAssassin daemon (spamd) using chkconfig command:

chkconfig --add spamassassin

On some Linux distributions, you may start/stop/query the SpamAssasin daemon (spamd) using the service command:

service spamassasin start

Or by directly executing the init script:

/etc/init.d/spamassassin start

Don't forget to create a daily cron job to update your SpamAssasin database:

sa-update && /etc/init.d/spamassassin restart

Configuration

Synchronet comes with a JavaScript implementation of the SpamAssassin spamd client (spamc).

To enable this client as a Synchronet External Mail Processor, edit your ctrl/mailproc.ini file, adding or updating the following section:

[SPAMC]
Command=spamc.js
AccessRequirements=user equal 0 or guest
ProcessSpam=false
ProcessDNSBL=false
Disabled=false

The AccessRequirements key value above tells the Synchronet Mail Server not to execute this mail processor for unauthenticated clients (user equal 0) or for the Guest user account, if there is one.

The ProcessSpam and ProcessDNSBL options tell the Synchronet Mail Server not to execute this mail processor if the message was received from a SPAM-blocked or DNS-Blacklisted sender.

Alternatively, you may specify To and/or From keys to limit the mail sender and/or recipients for which messages will be processed by SpamAssassin.

Command Line

The Synchronet spamc module supports some of the same command line options as the SpamAssassin spamc program and these may be included (with or without the dashes) in the Command key value included in the [SPAMC] section of your mailproc.ini file:

Option Usage Description
d -d address Specify IP address of spamd host (default: 127.0.0.1)
p -p port Specify the TCP port number of the spamd server (default: 783)
u -u usernameSpecify the user-id that spamd should run as
s -s bytes Specify the maximum message size (in bytes) that spamc will attempt to process (default: 500000)

In addition, the Synchronet spamc supports the following command line options:

Option Usage Description
spamonly spamonly Modify SPAM messages only (default: modify all messages)
reject reject levelReject SPAM messages over specified score threshold, modify and pass-through HAM
debug debug Enable debug log output

Examples

Modify and pass-through all messages:

Command=spamc.js

Modify SPAM messages only, pass-through all:

Command=spamc.js spamonly

Reject SPAM messages, modify and pass-through HAM:

Command=spamc.js reject

Reject SPAM messages over specified score threshold (8.0 in this example), modify and pass-through HAM:

Command=spamc.js reject 8.0

Reject SPAM messages over specified score threshold (8.0 in this example), modify SPAM, and pass-through HAM and SPAM:

Command=spamc.js reject 8.0 spamonly

See Also


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