So I guess NO ONE in the moodle community can help?
I have the same issue. It does'nt seem possible because the block cannot be added to the front page.
I know how to add a block in on every course page fron the front page. But no luck with Quickmail.
I tryed this too, but I could not a way that make it work.
See below one link to another plugin. I dont did test with him.
If you could try . If it work, tell to us, ok?