Blocking an email address means that you won't be able to receive anything sent to you by that email address.
If you have (accidentally) added the email account that sent you the email to the list of blocked contacts, make sure to unblock it first and then ask the sender to resend the email to you.
If you don’t receive the email in the next 2 minutes please check your junk folder, and add [email protected] to your safe sender list.