For emails related to submission, make sure you send the emails using the discussion feature of the submission section. It records the all the e-mails related to submission and keeps the data organized on a single screen.
Also, in the notify tab, choose the user roles from who you want to send and receive emails. You can learn more about managing and configuring user roles by visiting here!
PS: I’m attaching the screenshot for your reference.
Most importantly, you first try sending an email to yourself. If you’re getting the email, then the OJS email configuration has no problem sending or receiving any emails. There are chances that your emails are getting trapped by spam filters. So, check the spam folders; the emails might be getting rejected there.
Hope this helps!