If you use Hostinger Email and have a backup of your emails in EML, MIME, or Mbox format, you can easily import them via webmail. If you have several files, you can pack them into a .ZIP archive.
First, access the webmail of Hostinger Email. Then, click on More, and select Import messages:
Click on Browse to select your email backup file, and then click on Import to start the process:
Depending on the size of your file, it may take some time to complete the process. After the import is completed, a notification will appear: