Fetch mail via Pop3 from other account but do not delete mails

Hi!

I would like to fetch mails from another Pop3 account into my Zoho-mail-account. I saw the form, but no choice for leaving the mail on the external server or deleting it. Is there a choice? Is it possible to NOT delete the mail on the external server?

Up to now, I do not dare to use the service because I fear to loose my mails on that other server.

Thanks!