In Gmail you can receive messages from multiple email addresses in your inbox.
Enter your password for the selected account, and enter the correct type of server. Click "Add Account."
The server type is determined by the type of email address you are trying to add. Please see your help site for the designated address you are trying to add.
You can also customize how you want the messages to react when they are received; like if you want the messages deleted from the old account, and how you want them to appear when they are seen in your inbox.
A confirmation email will be sent to the other email address to confirm your request.
You can either click the link within the email sent to the alternative address, or you can enter the confirmation number.