Re: Modify message after send...?

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+Date: Sun, 19 Jul 2015 09:57:46 -0700\r
+From: MN <mailinglists@nawaz.org>\r
+To: David Bremner <david@tethera.net>\r
+Subject: Re: Modify message after =?UTF-8?Q?send=2E=2E=2E=3F?=\r
+In-Reply-To: <87a8uswpan.fsf@maritornes.cs.unb.ca>\r
+References: <878uacpwse.fsf@fester.com> <87a8uswpan.fsf@maritornes.cs.unb.ca>\r
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+\r
+On 2015-07-19 00:59, David Bremner wrote:\r
+> mailinglists@nawaz.org writes:\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 \r
+>> didn't\r
+>> find a clear good solution. Furthermore, I expect over time the \r
+>> rules by\r
+>> which I pick the From: field will get more complex than my knowledge \r
+>> of\r
+>> Elisp.\r
+>\r
+> I'm afraid it's a bit "some-assembly-required", but let me mention \r
+> one\r
+> possible solution.\r
+>\r
+> At least if you just want to have a regular expression match on the\r
+> recipient, then the example configuration in message-templ [1] may be\r
+> enough to get you started. You'd have to either call\r
+> message-templ-config-exec in a hook, or bind it to a key and call it\r
+> manually to set up the headers before sending.\r
+>\r
+> [1]: http://pivot.cs.unb.ca/git?p=message-templ.git;a=tree\r
+\r
+Thanks for this. I'll see if I can follow the Elisp code.\r
+\r
+After sending my email, it occurred to me that message handling is not \r
+notmuch's job - that's passed on to message-mode. I figured message-mode \r
+must have some kind of hook before sending the email, and sure enough, \r
+it does have message-send-hook. The example at \r
+www.gnu.org/software/emacs/manual/html_mono/message.html shows how one \r
+can add headers before sending. There's also message-alternative-emails, \r
+although that likely works only if you're replying to an email.\r
+\r
+A little frustrating: They have a number of functions to modify/read \r
+fields like Subject, or To - but none for From! So I'll still have to do \r
+some surgery. I'll likely use the send-message-hook to:\r
+\r
+1. Read the "To" & "cc" values.\r
+2. Pass them to an external Python script.\r
+3. Get the appropriate "From" field from the Python script.\r
+4. Insert it into the From: field.\r
+\r
+How does one do steps 2 & 3 in Elisp? I just need a pointer. (Just \r
+Googled and saw this: \r
+http://stackoverflow.com/questions/5014246/how-to-capture-standard-output-of-a-shell-command-in-elisp)\r
+\r
+Thanks,\r