From our marketplace site it looks like the latest version is compatable with Confluence 4.x.
I am not sure exactly how you are implementing the macro, but it looks like other users have had issues with the mail-success macro.
Adaptavist may get a chance to weigh in here, but I know they are great about getting back to those people that file support requests with them.
You may wish to drop a line to firstname.lastname@example.org or take a look at their support page on the marketplace
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