If you want to easily move emails from any IMAP account to Gmail. You can back up your Gmail with Softaken IMAP Mail Backup Software. You can use this tool to get emails from your IMAP account and save them in a format that Gmail can read. You won't lose any information when you upload your emails to your Gmail account after you have backed them up. This software is easy for anyone to use, even first-timers, and it keeps your emails and files safe while they're being sent. This Gmail Backup makes it easy, quick, and safe to move emails from IMAP to Gmail. It works with a lot of email clients, like Apple Mail, MS Outlook, Thunderbird, and more. It also comes with a free trial version.