How do you handle high bounce rates?

We are sending out newsletters every week and there is a high amount of bounce rate (around 20%). We need to find a proper solution to this, and we also started manually disabling the user's email preferences. But that takes a lot of time. Have any of you faced the same issue? If so, how did you fix it?

Note: we do not have any IMAP or POP3 server right now, but if that is the solution, let be it. Please help me with the problem. Thank you

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