sendmail, 4th Edition

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Beginning with V8.7 sendmail, two rule-testing commands became available: the =S command displays all the rules in a given rule set, and the =M command displays all the delivery agents. Both display their items after the configuration has been read. Thus, in the case of rules, all the macros will have already been expanded.

Both commands are triggered by the leading = character. If nothing follows the =, this usage message is printed:

Usage: =Sruleset or =M

If any character other than S or M follows the = character, the following error is printed:

Unknown "=" command =bad character here