Unblock a Sender in IncrediMail

Fat and water do not usually like each other too much. But add some egg yolk and stir, and you can make such delicious oil-in-water emulsions as sauce Béarnaise. Many of the proteins and the lecithin found in egg yolk like to bind to water at the one end and stick to fat with the other allowing the two mix.
Undoing all this is more difficult than untangling an email address from IncrediMail's blocked senders:
›› If you have inadvertently blocked a sender whose emails you do want to read in IncrediMail, here's how to remove them from the list of blocked senders again.