I've finished up the patch. It adds 3 checkboxes to the interface configuration, to enable the tabs Autoresponder, Mail Filter and Custom Filters respectively. I have two questions at this point:
1. I've tried setting the checkbox to checked by default, but it doesn't appear to work.
2. I'd like to commit the code. What's the best way to do that?
I've attached the patch to this post, it is written against version 126.96.36.199.
Thanks in advance for your time again.