What email address is best to send this file? I would like to add BitDefender to my contact list I have of antiviruses, but I haven't been able to find a good submission address.

Dear sir
The official email address for submitting suspected malware to BitDefender Labs is virus_submission@bitdefender.com. You will receive an answer regarding their nature after they are analyzed.
You could also attach files here, on the forum, or send the files directly to an analyst if you'd like.