Gmail: In your inbox view, click and drag this email into the "Primary" tab. When prompted, just click "Yes" to confirm.
Apple iPhone or iPad: When the email is open, tap email@example.com in the "From" line. On the next screen, tap "Create New Contact". Then tap "Done".
Microsoft Outlook 2013: Right-click on this email. Hover over "Junk" and then click the option "Never Block Sender".
Android: When the email is open, tap the icon next to firstname.lastname@example.org. Then tap "OK".
Apple Mail: Right-click on email@example.com. Select "Add to Contacts" or "Add to VIPs".
Outlook.com (formerly Hotmail): When the email is open, click the "Add to Contacts" link.
Yahoo! Mail: Right-click the email. Select "Add Sender to Contacts". Click "Save". Is that geeky enough for you?
Now you'll never miss another email!