Email deliverability issue

Hello everyone, I am new to the community. I am asking for help to solve a problem that is worrying me. I have a domain on my vps with whm, and I need to receive emails in large quantities (200 emails in approximately 10 minutes). The problem is that I tried to send 100 emails to one of my email accounts in cpanel and only 15 arrived in an hour. This happens with senders from different domains. I did a test with a free Gmail account and the 200 emails arrived in the Gmail account in less than 10 minutes. What should I configure in my whm so that the 200 emails arrive without problems? I thank you in advance for your help