Deleting and creating Mail server again

i have raised a discussion along with the logs and details and i didn’t received a solution for that.

here is the post https://community.cyberpanel.net/t/unable-to-receive-emails-from-snappy-mail-used-to-receive-mails-before/46653/3
since no one is responding to that i thinking to delete the mail server and re install it.
can anyone guide me to do it without losing mail accounts information?