Gmail can retrieve mail from up to five POP accounts. You can also send emails using these account addresses from within Gmail. After you set up Gmail to retrieve mail from other accounts, those addresses will appear as choices in the From field of emails you compose.
How to Transfer Emails from One Gmail Account to Another
Gmail can fetch mail from popular email services like GMX Mail, Windows Mail, and Yahoo Mail. These services may have specific instructions describing how to access the service in Gmail. If they don't, follow the general instructions below.
To have Gmail fetch email from an existing POP email account:
Select 'Show all settings'.