Enfold Contact Form don't work @ .org ???

Hello,

I use ENFOLD at two customers. All at the same hoster, two different webpacks, with the same configuration. On .de Domain there’s no problem. I use the Form, get the right report and all is fine.
But at the website with an .org, i get the report that the message was going out, but it doen’t sends the auto-reply or the message to the receiving email address.

Any ideas?

Thanks,
BOOM