Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!apple!veritas!tron
From: tron@Veritas.COM (Ronald S. Karr)
Newsgroups: comp.mail.misc
Subject: Re: Smail 3.1.19 -- Can I get a valid return address?
Message-ID: <1991Apr23.012420.5096@Veritas.COM>
Date: 23 Apr 91 01:24:20 GMT
References: <1991Apr20.194832.21739@coplex.uucp>
Organization: VERITAS Software
Lines: 35

In article <1991Apr20.194832.21739@coplex.uucp> dean@coplex.uucp (Dean Brooks) writes:
>   Of course, several uucp sites around me don't correctly put their
>entry in the message headers (no "Receieved:" lines).  Is there an
>environment variable (or a way to do this) that will allow me to use
>the "From:" (not the UUCP "From") line with all the name-comments
>and other garbage stipped off?  I would like to have a "@" type address
>if possible rather than a bang path, althought probably not possible.

In the general case this is impossible.  The reason is that the From:
header is not guarranteed to contain exactly one address (see RFC822).
However, I suppose that smail could be modified to get the first address.
Indeed, it is a reasonable enhancement idea.  To do this, you would need
to find the from: header in the header list, and then grab out the first
address.  The following code added to pipe.c:get_pipe_env() should do it:

	struct list *hp;
	struct addr *from_addr;
	char *error;
	...

	for (hp = header; hp; hp = hp->succ) {
		if (HDREQ("from", hp->text))
			break;
	}
	if (hp) {
		(void)process_field((char *)NULL, strchr(hp->text, ':') + 1,
				    (char *)NULL, (char *)NULL, &from_addr,
				    islocal?F_LOCAL:0, &error);
		if (error == NULL) {
			... add from_addr->in_addr into environment ...
		}
	}
-- 
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