Autoresponder plugin

[atomjani]

Post HTML Suite Plugin's DEMO

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I know that there are some autoresponder application, but this very important. There isn't integrated with mybb, and I have to this plugin. Perhaps someone else.
I want next functions:
When who joining to one groups, he get e-mail, pm, or both.

The individual subject is important, I can edit. The important, that how many days after sending the letter to the group since joining.
Example:
At 1. days: first letter.
At 4. days: second letter.
etc.
I can edit, that when sending the all letter. Example: 4:55.
I can add the user to backlist, because who don't want get letter in one groups.
I can edit or delete the all letter. I can ad {username} bbcode and unsubcribe link.
When who click to unsubsribe link, he is added to blacklist in groups. After he can resubcribe later.
The guest(unregistered) is can subcrible more letterlist, but he must add name and e-mail adress. He can unsubcrible. The simple html form is enought for subcrible.
This is useful, but is not very important:
I can add, edit, delete Autoresponder group, when I add some groups, users to list. The autoresponder group is content the all letter. And I can add group or user to backlist.

You can build on the foundations massmail and massmail task with database table or re-using this module, etc.

I know, that is big project. This is go more steps, and I help test this plugin.