How do I unblock mail or senders I have unblocked ?

Thanks for reaching out ConfusedRick,

It sounds like you're having trouble unblocking certain senders. We can help.

A great place to start is by following this guide to Change Blocked settings in Mail on Mac:

Use the Blocked pane of Junk Mail settings in Mail to change options for blocked senders.

To change these settings in the Mail app  on your Mac, choose Mail > Settings, click Junk Mail, then click Blocked.

Email address list

The list of email addresses whose messages you’re blocking.

Add , Remove 

Add an email address to the list of blocked senders, or remove one.

You can also add an email address to the list or remove it by clicking the arrow next to the sender’s name in a message, then choosing Block Contact or Unblock Contact.

Hope that helps.

Take care.