- subject = notmuch_message_get_header (message, "subject");
- if (subject) {
- if (strncasecmp (subject, "Re:", 3))
- subject = talloc_asprintf (ctx, "Re: %s", subject);
- g_mime_message_set_subject (reply, subject);
- }
+ in_reply_to = talloc_asprintf (ctx, "<%s>",
+ notmuch_message_get_message_id (message));
+
+ g_mime_object_set_header (GMIME_OBJECT (reply), "In-Reply-To", in_reply_to);
+
+ orig_references = notmuch_message_get_header (message, "references");
+ if (orig_references && *orig_references)
+ references = talloc_asprintf (ctx, "%s %s", orig_references,
+ in_reply_to);
+ else
+ references = talloc_strdup (ctx, in_reply_to);
+
+ g_mime_object_set_header (GMIME_OBJECT (reply), "References", references);