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:- https://www.linkedin.com/jobs/view/1533162302 But i also wanted to send my resume via email, So i sent an email to below addresses:- [email protected] [email protected] [email protected] 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