How to Save the contacts of incoming mails in gmail

Email support guide to save the incoming mails in gmail

There is a setting that you can make incoming email IDs in contact list automatically.Don't know yahoo has the setting.Take a carefully look and see.
Or try this:

1. Click Contacts along the left side of any page.
2. Click the New Contact button in the top-left corner of the Contact Manager.
3. Enter your contact's information in the appropriate fields.
4. Click Save to add your contact.

You can enter additional contact info by clicking More Information or by clicking the add link next to the appropriate field. Enter your contact's information in the appropriate fields and click Save.

Email addresses are automatically added to your Contacts list each time you use the Reply, Reply to all, or Forward functions to send messages to addresses not previously stored in your Contacts list. If these addresses don't appear immediately, try waiting a few minutes or signing out of your account and signing back in. "Also, each time you mark a message as 'Not Spam,' your Contacts list is automatically updated so that future messages from that sender are received in your inbox.