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From: Per Abrahamsen <abraham@dina.kvl.dk>
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Subject: Re: Mail without `From:' lines
Date: 06 May 1996 17:18:38 +0200
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>>>>> "SJ" == Sudish Joseph <sudish@VNET.IBM.COM> writes:

SJ> Here's a real example: *Every* message I receive from the internet has
SJ> envelope sender set to a fixed address of this form:
SJ> <@smtp.relay,relay.id@vm.node.that.doesn't.speak.tcp.ip>
SJ> (also a nice real world example of a valid use of source routes)

How does it From: header looks?

If it looks right, the example is irrelevant.

SJ> I'll detect the
SJ> lack of a From: line when I try to reply to any such errant message,

Have you ever received such a message?  I have been unable to generate
one with sendmail or /bin/mail here.  As I noted in another message,
sendmail insist on putting the envelope address in the From: line if
there isn't one in the first place.

SJ> At least make this an option that defaults to nil.

Why should the default be something that is wrong in all examples you
and me can think of?