The best tool you can rely on is the IMAP Backup Tool. It allows you to back up emails from any IMAP-enabled email server, including Gmail, Yahoo, Outlook, and more, into formats like PST, MBOX, EML, and PDF. The tool ensures complete data security, maintains folder hierarchy, and offers a date filter for selective backups. Plus, it even provides an option to delete emails from the server after backup to free up storage. If you need a reliable and efficient way to back up your IMAP emails, this tool is a perfect choice.