Introduction

Last Updated: 29 Jan 2010 GMT +8.

This plugin provides an ability for rejecting/deferring/tagging messages based on $RBLCHECK environment variable. $RBLCHECK is set by patched rblsmtpd if the sender's IP is listed.

IMPORTANT: This plugin is written for and tested with mailfront 1.12 and should work with later version.


Environment Configuration

$RBLCHECK_REJECT
If set, messages will be rejected with code 554.
$RBLCHECK_DEFER
If set, messages will be deferred with code 451.
$RBLCHECK
Do not set this environment variable as this is set by using patched rblsmtpd. You need to patch ucspi-tcp-0.88/rblsmtpd.c with the combined patch (ucspi-tcp-0.88-rblsmtpd.c-combined.patch) provided in this package.

Sender Action

None

Recipient Action

None

Data Action

When client starts to transmit data, this plugin will start its checking for $RBLCHECK environment variable. If $RBLCHECK is not empty, the message will be rejected or deferred or tagged.

If $RBLCHECK_REJECT is set, message will be rejected with code 554.

If $RBLCHECK_DEFER is set, message will be deferred with code 451.

If $RBLCHECK_REJECT and $RBLCHECK_DEFER not set, the following line will be added to the message header:

X-RBL-Check: rbl1 rbl2 rbl3

If you run rblsmtpd -l zen.spamhaus.org -l rbl.spamcop.net -l dnsbl.njabl.org -l cbl.abuseat.org -l dnsbl.sorbs.net -l accredit.habeas.com -l plus.bondedsender.org -l iadb.isipp.com, rblsmtpd set the $RBLCHECK environment variable with zen.spamhaus.org cbl.abuseat.org means the sender's IP is listed at zen.spamhaus.org and cbl.abuseat.org RBL database:

X-RBL-Check: zen.spamhaus.org cbl.abuseat.org

Note: If sender is authenticated or $RELAYCLIENT environment variable is set, then this plugin will be skipped.


Message Action

None

Requirements

  • mailfront version 1.12 or later
  • bglibs version 1.104 or later (might work with earlier version)
  • patch ucspi-tcp-0.88 with ucspi-tcp-0.88-rblsmtpd.c-combined.patch provided

Installation

  • Build and install mailfront
  • Switch back to this package
  • Adjust the contents of the conf-* files
  • Build the sources by running "make"
  • Install the plugin by running "make install"

Mailfront Plugins Configuration

Place rblcheck in mailfront's plugin list. Depending on your setup:

  • edit the smtpfront-qmail shell script and place the string rblcheck after add-received
  • edit the PLUGINS environment variable and place the string rblcheck after add-received
  • place the argument rblcheck after the add-received of the mailfront command

Set up environment as described in Environment Configuration above or plugin-rblcheck.html which is included in the package.


License

This package is copyright © 2010 Giam Teck Choon or CHOON.NET, and may be copied according to the GNU GENERAL PUBLIC LICENSE (GPL) Version 2 or a later version. A copy of this license is included with this package. This package comes with no warranty of any kind.


Changes

  • 29 Jan 2010 GMT +8 : version 0.01
  • Initial release

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