Church Events Calendar request email failure

Person who request an event receive email that have subject: Mail failure - malformed recipient address.

Request is ok. But failure message to customer is not good thing.

And should there be an email notify to someone from that request, no such email received. Where you define receivers? [ed. note: valokammi last edited this post 13 years ago.]

Quiet. Is this Add-on alive any more? Are there substitutes with web user request?