Moving a website often involves migrating domain-related emails as well. Before proceeding with this operation you need to check some parameters.
First, before the transfer, you need to check if the mail is stored on the server, then configured in IMAP, or downloaded to your mail client, then configured in POP3. If the emails are configured in IMAP and then stored on the server, it will be necessary to configure them in POP3 and download them on your PC. If they are configured in POP3 it will not be necessary to proceed with further operations.
It will be possible to create the same identical previous e-mail accounts thanks to the preventive access to the control panel: before the domain is transferred, it will be possible to create the same accounts and therefore not lose any e-mails during the transfer.