In Mozilla Thunderbird, you may simply select 'Mark As Not Junk' on any e-mail you receive.
To add us as a safe sender without an email, follow these instructions:
1. Click on 'Address Book'.
2. Highlight 'Personal Address Book'.
3. Click 'New Card'.
4. Under a tab labeled 'Contact', enter firstname.lastname@example.org in the 'From' address and click 'OK'