Yahoo Mail - General Tips for Receiving All of Your ALT.com Emails:
1. Do not click the "Spam" button when you are viewing any ALT.com email. Marking one ALT.com email as spam may prevent you from getting any future ALT.com emails.
2. Add ALT.com email addresses to your Address Book by completing the following steps:
Or, click the "Add Contact" button.
b) Enter any of the ALT.com email addresses from email you've received into the "Email" field.
c) Click the "Save" button.