Modify message after send...?

diff --git a/0e/86a85c850c299d3d66ddc84477448c8f558dbc b/0e/86a85c850c299d3d66ddc84477448c8f558dbc
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+From: mailinglists@nawaz.org\r
+To: notmuch@notmuchmail.org\r
+Subject: Modify message after send...?\r
+User-Agent: Notmuch/0.19 (http://notmuchmail.org) Emacs/24.4.1\r
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+Date: Sat, 18 Jul 2015 21:59:45 -0700\r
+Message-ID: <878uacpwse.fsf@fester.com>\r
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+\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
+Thanks.\r
+\r
+-- \r
+My sister opened a computer store in Hawaii. She sells C shells down by\r
+the seashore.\r
+\r
+\r
+                    /\  /\               /\  /\r
+                   /  \/  \ u e e n     /  \/  a w a z\r
+                       >>>>>>mueen@nawaz.org<<<<<<\r
+                                   anl\r
+\r
+ \r