quick news item:
a) the official URL:
http://www.symbianware.com/product.php?id=smsmach60&lang=en&pl=all&s=0
b) the description (taken from that URL)
SmsMachine is a fully customized SMS answering machine for your smartphone. You can predefine any number of response messages automatically sent to people calling you or sending SMS or MMS to you to fully customize your needs.
There are custom responses for persons from contacts, for groups of persons from contacts, for custom phone numbers, default response, black list, selective situations, message templates, tight interaction with Contacts and Messaging applications, handy log, etc, etc...