If you're looking to transfer your emails, you would need to use IMAP SYNC tool.
On the left, add your full email address, password, and IMAP server name of the email that you want to move from.
On the right, enter your details for the destination email. If it's your Hostinger email, the IMAP server name will be imap.hostinger.com. Just make sure you create the account before initiating the move.
Click the Sync button and wait for the synchronization to complete:
Check your destination email if it synchronized the emails for you!
That’s it! Now you know how to sync your emails.
IMAP Sync tool has a limit of 3 Gb so if your email account is bigger it is recommended to back it up through an email client
If you are using cPanel your IMAP server will be mail.yourdomain.tld