Re: Modify message after send...?

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+From: David Mazieres <dm-list-email-notmuch@scs.stanford.edu>\r
+To: mailinglists@nawaz.org, notmuch@notmuchmail.org\r
+Subject: Re: Modify message after send...?\r
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+Reply-To: David Mazieres expires 2015-10-19 PDT\r
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+Date: Tue, 21 Jul 2015 17:21:36 -0700\r
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+\r
+mailinglists@nawaz.org writes:\r
+\r
+> Hi,\r
+>\r
+> I use notmuch via Emacs.\r
+>\r
+> Here's what I want:\r
+>\r
+> When I hit C-c C-c to send a message, I'd like it to be passed to a\r
+> script (likely a Python one, although I may consider an Elisp function\r
+> if an external script is not possible) for modification of headers,\r
+> before it is sent to the MTA (Postfix in my case). A bonus would be to\r
+> have the modified message stored in the FCC location, instead of the\r
+> original one.\r
+>\r
+> Is this possible? An alternative may be to modify the message /before/\r
+> it goes to message-send-and-exit. I'm inexperienced in Elisp - would\r
+> this be via what's called "advising"?\r
+>\r
+> BTW, all I really want to do is modify the From: field based on the\r
+> recipients (for every email, with no default From). I'll welcome\r
+> suggestions for existing ways to do that. I Googled a little, but didn't\r
+> find a clear good solution. Furthermore, I expect over time the rules by\r
+> which I pick the From: field will get more complex than my knowledge of\r
+> Elisp.\r
+\r
+For modifying the From field, I recommend doing it before you send the\r
+message, as this gives you an opportunity to see what you are about to\r
+send and possibly edit it by hand.\r
+\r
+I do something like this using defadvice around notmuch-mua-mail, do\r
+adjust things about my messages.  I also put a defadvice around\r
+notmuch-call-notmuch-sexp to filter the To and Cc headers I get from\r
+"notmuch reply" (because notmuch won't let me put wildcards in my\r
+.notmuch-config file).\r
+\r
+Finally, and possibly most relevant to you, I use a message-send-hook to\r
+insert the Return-Path address and make a few more modifications before\r
+sending a message.  Note that I only do this if there isn't already a\r
+Return-Path header.  That way, if I type C-c C-c and don't like what I\r
+see, I edit the result and send again, leaving the generated Return-Path\r
+header, and this time it goes through unmodified.\r
+\r
+David\r