PayPal allows to link up to 8 email addresses to the same PayPal Account. This trick can be useful when a site requires an email linked to a PayPal on raffle registration, without log in.
First of all, log in to your PayPal account, and follow this link.
Secondly, click the following button in order to add a secondary email address to the PayPal Account.
Once you click the button, a menu will appear. Introduce the email you want to link.
From now on, the email address provided is linked to the PayPal account as a secondary address. Now, your account must appear like this, with two addresses. The limit is 8.
Last step is confirming your new account, just follow the link provided in the mail received on your secondary email inbox.