diff --git a/emacs/notmuch-lib.el b/emacs/notmuch-lib.el
index c159dda9..6907a5f9 100644
--- a/emacs/notmuch-lib.el
+++ b/emacs/notmuch-lib.el
@@ -237,9 +237,12 @@ the given type."
   (or (plist-get part :content)
       (notmuch-get-bodypart-internal (notmuch-id-to-query (plist-get msg :id)) nth process-crypto)))
 
-(defun notmuch-plist-to-alist (plist)
+;; Converts a plist of headers to an alist of headers. The input plist should
+;; have symbols of the form :Header as keys, and the resulting alist will have
+;; symbols of the form 'Header as keys.
+(defun notmuch-headers-plist-to-alist (plist)
   (loop for (key value . rest) on plist by #'cddr
-	collect (cons (substring (symbol-name key) 1) value)))
+	collect (cons (intern (substring (symbol-name key) 1)) value)))
 
 ;; Compatibility functions for versions of emacs before emacs 23.
 ;;
diff --git a/emacs/notmuch-mua.el b/emacs/notmuch-mua.el
index 6aae3a05..cfa3d613 100644
--- a/emacs/notmuch-mua.el
+++ b/emacs/notmuch-mua.el
@@ -127,7 +127,7 @@ list."
 	  ((same-window-regexps '("\\*mail .*")))
 	(notmuch-mua-mail (plist-get reply-headers :To)
 			  (plist-get reply-headers :Subject)
-			  (notmuch-plist-to-alist reply-headers)))
+			  (notmuch-headers-plist-to-alist reply-headers)))
       ;; Insert the message body - but put it in front of the signature
       ;; if one is present
       (goto-char (point-max))
@@ -185,11 +185,11 @@ OTHER-ARGS are passed through to `message-mail'."
   (when notmuch-mua-user-agent-function
     (let ((user-agent (funcall notmuch-mua-user-agent-function)))
       (when (not (string= "" user-agent))
-	(push (cons "User-Agent" user-agent) other-headers))))
+	(push (cons 'User-Agent user-agent) other-headers))))
 
-  (unless (mail-header 'From other-headers)
-    (push (cons "From" (concat
-			(notmuch-user-name) " <" (notmuch-user-primary-email) ">")) other-headers))
+  (unless (assq 'From other-headers)
+    (push (cons 'From (concat
+		       (notmuch-user-name) " <" (notmuch-user-primary-email) ">")) other-headers))
 
   (apply #'message-mail to subject other-headers other-args)
   (message-sort-headers)
diff --git a/test/emacs b/test/emacs
index 576bc1f0..30654bb9 100755
--- a/test/emacs
+++ b/test/emacs
@@ -286,7 +286,6 @@ EOF
 test_expect_equal_file OUTPUT EXPECTED
 
 test_begin_subtest "Reply from alternate address within emacs"
-test_subtest_known_broken
 add_message '[from]="Sender <sender@example.com>"' \
 	     [to]=test_suite_other@notmuchmail.org