I have been forwarding emails from my university-based Gmail account to my personal Gmail account for years, and there are no copies of the emails in the original Gmail account. Now I graduated and I want to move these already read emails back to the original account so that they do not take 10GB space in my personal Google account space. Is there a way to do this?
To fetch emails with the new (or old one) Gmail account do the same procedure:
Log into your new Gmail account. Hit the gear icon. Select 'Settings'. Go to the 'Accounts and import' tab. Go to the 'Check mail from other accounts' section. Select 'Add a mail account'. Enter your old Gmail account and hit 'Next'.