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NMS relay control

I've modified the source code of Netscape-supplied antirelay.c plugin for Netscape Messaging Server 4.15 so that it grants relaying based on whether the sender e-mail address is in the delivery domain (in addition to original recipient e-mail address and hosts-based submission control).

You can download the modified code here.

Usage:
Just as with the original Netscape version of the plug-in, you specify your delivery domains in antirelay.conf:

delivery:*@your.domain.com
delivery:*@your.domain.com.pl
With the original plug-in, NMS would accept all smtp transactions with "rcpt to:" matching any of these patterns. With my version, NMS also accepts smtp transactions with "mail from:" matching those patterns.

Links:

Preventing relaying in Netscape Messaging Server

Netscape's original documentation: "Anti-Relaying Defenses"