I want to fetch it using Gmail, which, I already know, doesn't support fetching mail from IMAP accounts. Only POP3. I've read other questions here with no useful responses, or proposed solutions that involve having a server working in a computer of my own, but I want to find an entirely internet-based solution.

Login Different Gmail or Google Accounts in Same Browser Google conventionally did not allow using accounts associated with different Gmail IDs at the same time. We have already discussed in the past ways to switch quickly between Gmail accounts.Now there is an official way to link different Google accounts so that you can use Gmail, Google Reader, Google Voice, and other services with just a click of the mouse within the same browser. G Suite admin can access your emails without knowing your Login to G Suite Control Panel. To achieve this, we need to login to our G Suite admin console, … How to Combine Two or More Gmail Accounts

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Dec 08, 2017 Share site with gmail or other external account Jul 11, 2016 How to Add an Account to Your Gmail: 8 Steps (with Pictures)

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How to add your Gmail account to Windows 10's Mail app Dec 15, 2016 How to find all of your Gmail accounts - Quora Never mind, found it myself: http://support.google.com/mail/bin/answer.py?hl=en&answer=46346