Email Software

Apologies if I am not in the correct forum. I am an office assistant and my boss asks me to send his resume to a list of emails I extracted online. I am using his google account to send them but it cannot reach to 300 emails per day as he instructed. I need a good email sender to send his resumes and at the same time place a copy of the sent emails in his gmail account for him to check on. I tried groupmail but it always blocks my emails whenever I send them. Any help would greatly be appreciated.

If he is sending out his resume to 300 people, tell him to do it himself, he won;t be your boss for long, he's on the move.