Most email clients come with Internet Message Access Protocol (IMAP). Simply put, it lets you access another email server from within your email client and treat it as if you have two email services coming in one client. For example, you have an Outlook and Gmail account. You can set up IMAP in Outlook so you can get your Gmail messages from within Outlook. In essence, you can move emails between the two accounts. Post Office Protocol (POP), on the other hand, only lets you get messages one way.
Because of IMAP, I easily moved hundreds of messages off of my computer in Thunderbird to Gmail's web-based server. Both accounts appeared in Thunderbird with their own folders. I dragged 'n dropped emails from my personal account into Gmail's folders. It can take time for the messages to transfer, but not too bad.
The first thing to do is enable IMAP in Gmail.
- Sign in Gmail.
- Select Settings at the top of Gmail.
- Select Forwarding and POP/IMAP.
- Select Enable IMAP.
- Select Save Changes.
Since the email client you use may not be Outlook or Thunderbird, here's a generic overview of how to move the messages between your computer and Gmail. You simply create a new account, select IMAP, enter your email ID information and Gmai's server info with imap.gmail.com as the incoming server and smtp.gmail.com as the outgoing server. Gmail has instructions for setting IMAP on various email clients.
Now you can freely move emails between your two accounts. You made it this far. Why not go the extra mile and clean up your email?