Interview
Check your deleted folder in your email account, you may get lucky and find it there. Otherwise, try to resubmit your info online and try to have another email sent. Last option would be to call and see if you can talk with somone who will send you the email again, however they might ask why you deleted it in the first place.
After you get the interview date just be sure to study the technical/HR info needed to be a successful candidate.