Sherry,

I found the following on unblocking senders in Live Mail. The link is at 
the end, so you can read more on related topics.

Ciao

How to Unblock an E-Mail Sender
By
Dan Gookin
from
Troubleshooting Your PC For Dummies, 3rd Edition

The Blocked Senders tool was a welcome addition to the email
programs
  that ship with Windows. It worked! Sometimes, it worked too well. The 
biggest problem people had with it was blocking people they didn’t mean 
to block.
Oops.

Here’s how to unblock an accidentally blocked sender in Windows Live 
Mail and Windows Mail:

list of 5 items
1. Get to Junk E-Mail Options.

list of 2 items nesting level 1
• In Windows Live Mail, choose Actions→Junk E-Mail→Safety Options. You 
may have to press the F10 key to expose the Actions menu.

• In Windows Mail, choose Tools→Junk E-Mail Options.
list end nesting level 1

2. Click the Blocked Senders tab.

3. Select the user you want to unblock.

Users are listed only by email address, so it helps to know their addresses.

4. Click the Remove button.

5. Click OK.
list end


http://www.dummies.com/how-to/content/how-to-unblock-an-email-sender.html


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