QuoteFix is a plug-in for Apple Mail which enables "bottom-posting": instead of replying above a message (as Apple Mail does by default), it will place the cursor below the original message when you reply to, or forward, a message.
Other features include:
- removing the senders signature from the reply
- customized attributions (including HTML and templating)
- and generally cleaning up replies/forwards so your messages will look good, clean and spiffy
- Preliminary support for Mail 9.3
- OS X 10.8 or later