These scripts combine with Auto FollowUp. AFU allows people to subscribe to the autoresponder by 電子メール, but this collection contains a script that will actually answer an 電子メール! It will respond to 電子メール subscribe and unsubscribe requests.
Set up your client's web site so they can edit content from any browser. They don't need to worry about messing up your デザイン, because they can only change the content.