Path: utzoo!attcan!uunet!wuarchive!cs.utexas.edu!evax!utacfd!letni!mic!ernest!alan
From: alan@ernest.ti.com (Alan Edmonds)
Newsgroups: comp.mail.sendmail
Subject: Sendmail/UUCP Header Rewrite Question
Message-ID: <1450@ernest.ti.com>
Date: 10 Oct 90 13:49:46 GMT
Sender: alan@ernest.ti.com
Organization: Texas Instruments, Inc. Plano TX
Lines: 24

One of the sites I get mail from (call them site) insists on rewriting the From:
header from user@host.domain into site!user@host.domain.  This makes 
a reply address get really mangled.  I looked over site's sendmail.cf
file and found the following:


############################################################
###  UUCP Mailer specification
############################################################
Muux,	P=/usr/bin/uux, F=sDFMuU, S=13, R=23, M=100000, 
	A=uux - -r $h!rmail ($u)

S13
R$+			$:$>5 $1			convert to old style
#--R$*<@$*>$*		$@ $1<@$2>$3			don't mung! (?)
R$=R!$+			$2				avoid redundancy
R$+			$:$R!$1				stick on our UUCP name

S23
R$+			$:$>5 $1			convert to old style

In ruleset S13, last rule inserts their site name in front of the address.
Is this a "good" idea?  How do other sites handle this kind of situation?
Why not delete the last rule (in S13) and be done with it?