Linux System Administrator Job at Applied Research Solutions (ARS), USA

I applied on Linkedin for Linux Admin at Applied Research Solutions (ARS), USA at below link:-

But i also wanted to send my resume via email, So i sent an email to below addresses:-

I received two bounce-backs for info and careers.
550 #5.1.0 Address rejected.

But didn’t receive any bounce back for [email protected] so i think this address exist and they might get my email