I currently host mail accounts on a VPS, which I want to move to a hosted CPanel account.
Mail is handled by Postfix and Dovecot, but I don't know much about the server I want to move the mail to.
How can I move the mail files to the new host?
As per John Siu's comments, there are five email accounts; I'm not sure what is meant by 'Linux accounts or virtual accounts'; I don't have access to all account passwords, but these can easily be reset; all accounts use IMAP.