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Listing 1. A minimal Sendmail configuration file is required to test rules.

A. Here's x.cf, a minimal, do-nothing configuration file:

Mlocal, A=X, P=X
Mprog,  A=X, P=X
Do.:%@!^=/[]

B. Run version 8 Sendmail in rule-testing mode:

% /usr/lib/sendmail -oQ/tmp -Cx.cf -bt
ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
Enter <ruleset> <address>
> 0 bob@here
rewrite: ruleset  0   input: "bob" "@" "here"
rewrite: ruleset  0 returns: "bob" "@" "here"
> [Control-D]
% []

Listing 2. This example creates a ``demo'' rule set that illustrates a few introductory concepts about rules.

A. Your first ``demo'' rule:

Mlocal, A=X, P=X
Mprog,  A=X, P=X
Do.:%@!^=/[]
S0
Rleft.side     new.stuff      this is a comment

B. Run version 8 Sendmail in rule-testing mode and enter an address.

% /usr/lib/sendmail -oQ/tmp -Cx.cf -bt
ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
Enter <ruleset> <address>
> 0 bob@here
rewrite: ruleset  0   input: "bob" "@" "here"
rewrite: ruleset  0 returns: "bob" "@" "here"
> []

C. Workspace does match the left-hand side:

> 0 left.side
rewrite: ruleset  0   input: left . side
rewrite: ruleset  0 returns: new . stuff
> []

Listing 3. Three new ``demo'' rules.

S0
Rx     y
Ry     z
Rz     a

Listing 4. Four new ``demo'' rules.

Mlocal, A=X, P=X
Mprog,  A=X, P=X
Do.:%@!^=/[]
S0
R@         $@one
R@$+       $@two
R$+@$+     $@three
R$+        $@four