sendmail, 4th Edition

Dump a Class Macro with $=

The $= rule-testing command tells sendmail to print all the members for a class. The class name must immediately follow the = with no intervening space, or the name is ignored. Both single-character and multicharacter names can be used:

$= X            ← the X is ignored
$=X             ← list the members of the class X
$={YYY}         ← list the members of the multicharacter class YYY

The list of members (if any) is printed one per line:

> $=w
here.our.domain
here
[123.45.67.89]
fax
fax.our.domain
>

To illustrate one use for this command, imagine that you just made the local host the fax server for your site. Of course, you were careful to modify the configuration file and add fax and fax.our.domain to the $=w class in it. But incoming mail to fax.our.domain is still failing. You run sendmail in rule-testing mode, as earlier, to verify that the correct entries are in $=w:

here.our.domain
here
[123.45.67.89]
fax                    ← correct
fax.our.domain         ← correct

Because they are correct, it could be that you made the mistake of changing the configuration file and failing to restart the daemon (Daemon mode (-bd) on page 20). The following command line fixes the problem (SIGHUP on page 509):

# kill -HUP `head −1 /etc/mail/sendmail.pid`