If you have a backup of your emails in EML, MIME, or Mbox format, you can easily import them to Hostinger Emails using Webmail. If you have several files, you can pack them into a .zip archive.
For this, just access Webmail, then click on More and Import messages:
Browse to select your email backup file and click on Import to start the process:
Depending on the size of your file, it may take a few minutes to complete the process. After the import is completed, you will see a notification: