The document describes new sendmail feature for selecting custom rule set in relays/mailertable insted of direct mailer selection. The rule set is expected to select mailer.
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some.domain mrs_rule_set:paramIt will make sendmail call mrs_rule_set with
<param>user<@some.domain>mrs_rule_set is expected to select mailer/host/user triple
define(`LUSER_RELAY',`mrs_rule_set:param')dnlIt will make sendmail call mrs_rule_set with
<param>user<@param>mrs_rule_set is expected to select mailer/host/user triple
patch -p1 < mrs-8.12.11.patch
The above patch can be aplied to sendmail-8.13.0.