Re: exim pipe transport, notmuch insert and mbox-style messages

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+Date: Sat, 29 Nov 2014 12:57:14 +0000\r
+From: Edward Betts <edward@4angle.com>\r
+To: notmuch@notmuchmail.org\r
+Subject: Re: exim pipe transport, notmuch insert and mbox-style messages\r
+Message-ID: <20141129125714.GA23134@x230>\r
+References: <20141122092851.GA31815@x230>\r
+ <87tx1r7enm.fsf@maritornes.cs.unb.ca>\r
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+\r
+David Bremner <david@tethera.net> wrote:\r
+> Edward Betts <edward@4angle.com> writes:\r
+> > I wonder if 'notmuch insert' could be modified to detect and drop the From_\r
+> > line before writing the message to disk and index it. It could do that\r
+> > silently or with a warning.\r
+> \r
+> I don't know about the larger question(s), but I'd suggest just escaping\r
+> it to something like X-Envelope-From: . There may even be some\r
+> semi-standard header to use for this.\r
+\r
+The main piece of information in the From_ line is the return path address, a\r
+properly configured MTA will add a Return-path header.\r
+\r
+RFC 2821 says the Return-path header is added to a message "when the\r
+delivery SMTP server makes the final delivery".\r
+\r
+I don't think the From_ line needs to be captured into an X-Envelope-From\r
+header.  We could make 'notmuch insert' add the 'Return-path' header to\r
+messages if it is missing, but the From_ line is present. This is probably too\r
+much complexity.\r
+\r
+-- \r
+Edward.\r