Upload email (EML files) to POP server

I am trying to move my mails from one hosting provider to another.

I have downloaded my emails from my previous hosting provider (which supports IMAP) as EML files using a software. Now I have all my emails as EML files.

My new provider doesn't support IMAP. It supports only SMTP and POP.

How can I upload all emails to my new provider?

You cannot upload to a POP3 box - it doesn't support upload, it's a one-way protocol (download only).

The only way you can get your messages back into POP3 is to email them to youself.

The best way is with Thunderbird and install the Mail Redirect addon so you can forward the messages from one account to another without modifying the headers.

Of course, this relies on you still having access to the original IMAP service.