If your using a yahoo account, add their email to the yahoo address book.

To add the sender of an email to your Contact List, right-click on the email in your Inbox and select Add Sender to Contacts.

To do a mass mailing to everyone in your Address Book:
Click the Compose link to start to write the email. Then, click the To button. A list of everyone in your Address Book will pop up. You can easily select all the names: Click the first name in the list, then scroll down and Shift-click the last name. That selects all the names. Click OK.

Part 1: To add the addresses of emails in your inbox to your address book
a) Go to adress book and click on the “quickbuilder” button.
b) Check all the options and uncheck the filters
c) proceed.
Part 2: To send email blast
a) go to address book and add a new list
b) select all the ids and create a list
c) click “to” when you compose a mail and select this list