-set of messages and constructs a suitable mail template. The Reply-to:
-header (if any, otherwise From:) is used for the To: address. Unless
+set of messages and constructs a suitable mail template. Its To:
+address is set according to the original email in this way: if the
+Reply-to: header is present and different from any To:/Cc: address it
+is used, otherwise From: header is used. Unless