If you still aren't receiving mail after unblocking, consult JustAnswer or similar expert forums to check for deep-level filtering or SMTP configuration issues.
In the "Blocked addresses" column, find the address and click the icon next to it. Advanced and Specific Issues how to unblock emails
If you still have an email from the person in your Trash or Spam folder: If you still aren't receiving mail after unblocking,
If you have removed them from the blocked list but they still can't email you: how to unblock emails
Under the section, find the email address or domain you want to restore.
Open the email and tap the banner at the top.