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
Hi team, I’m Avinoam, a product manager on Confluence Cloud, and today I’m really excited to let the Community know that all customers can now try out the new editing experience and see some of the ...
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