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From: philipp@ATHENA.MIT.EDU
Newsgroups: net.emacs
Subject: Re:  copies of outgoing sendmail messages
Message-ID: <5360@mit-eddie.UUCP>
Date: Sun, 22-Sep-85 19:22:21 EDT
Article-I.D.: mit-eddi.5360
Posted: Sun Sep 22 19:22:21 1985
Date-Received: Mon, 23-Sep-85 02:59:34 EDT
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Organization: MIT, Cambridge, MA
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From: philipp@ATHENA.MIT.EDU
If you use Mail(1), put in your .mailrc file the line

	set record={your-home-dir}/{mail-record-file}

and this will log your mail.
It depends only on the front-end you use.  The reader, not the router.