The Thunderbird desktop app for Linux has a “Export to Mobile” feature. It generates a QR code that you can scan on your phone to, I guess (I haven’t tried it), transfer the login info of your email accounts from desktop to phone. After that, IMAP should take care of syncing the emails from the server to each device.
I have friends and family who work in schools. They’ve all had to put out statements saying they won’t cooperate with immigration to the extent they can.