The new Manage Subscriptions view in Gmail will help you reclaim an inbox overrun with emails you don’t want.

Sick and tired of all of the annoying subscription emails spamming your inbox? Don’t despair, Google has help.

Using my test Gmail account that held about 75,000 messages, I got a download from Google Takeout in about 2 hours. Once you've saved a copy of your emails, you're ready to begin transferring them.