After unblocking, future emails from that sender will arrive safely in your Inbox. Just remember that unblocking doesn't automatically pull old emails out of Spam—you’ll need to manually move those if you still want to read them. How to Unblock Emails in Gmail
If you want to unblock emails from a sender that are being incorrectly marked as spam: how to unblock emails on gmail
If the emails are long gone, you must visit the "Vault of Filters" to find them: After unblocking, future emails from that sender will
To unblock emails on Gmail, follow these steps: how to unblock emails on gmail
Whether you are using a computer or a mobile device, here is a complete guide to reclaiming your inbox. How to Unblock a Sender from an Email (Desktop & Mobile)