Some people believe that mailing lists should not add Reply-To: headers to mail posted through the list, known as ReplyToMunging, on the grounds that distinguishing whom a reply should be addressed to is the recipient's MailClient's job. See: 
http://www.unicom.com/pw/reply-to-harmful.html
There is a constant ReligiousWar with people who prefer ReplyToMunging.
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