S11 ruleset で、R$=D& で始まる行の後に次の行を挿入します。
R@ $@mailer_daemon<@$w> for @@hostname problem
S11 R$*<@$+>$* $1<@$2>$3 already ok R$=D $@$1<@$w> tack on my hostname R@ $@mailer_daemon<@$w> for @@hostname problem R$+ $@$1<@$m> tack on my mbox hostname