1. Use Google Takeout to download your emails as MBOX
2. Download your emails over SMTP or POP using an email client and import them into another email account. I believe Thunderbird can do this.
3. If you're switching to FastMail they have a import tool based on SMTP.
1. Use Google Takeout to download your emails as MBOX
2. Download your emails over SMTP or POP using an email client and import them into another email account. I believe Thunderbird can do this.
3. If you're switching to FastMail they have a import tool based on SMTP.