I Was Contacting It On Buildbox's Email?

Hello Buildbox

I was sending it to on you guys in the emails and It's keeps saying it to me error messages when I sent it: Unbelievable sent email: (Notification Emails)
Delivery sent to the following recipients failed...
Support@buildbox.com

I need sending it to you a questions about on my releasing it on my first times. But there's a no ways to contacting it on the support regarding it about on my games.