If anyone gets such an email and there is an attachment which might say something like Fedexinvoice, never ever open the attachment - it contains a virus. Alternatively it's just asking for personal information such as bank details or asking for a payment.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .