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早期freebsd实现

setenv MAILPOSTER "~/bin/rnmail %h"
setenv MAILHEADER \
'To: %T\
Subject: %(%i=^$?:Re: %S\
Fcc: +CC\
Newsgroups: %n\
In-Reply-To: %i)\
%(%[references]!=^$?References\: %[references]\
)Organization: %o\
\
'