Not that I’d EVER recommend it, but:
Buy a cheap “prepaid” phone, with cash. Don’t forget to wear your mask.
Go to your least favorite coffee shop, sign into their free wifi. Walk in from down the block. Wear your mask.
Get a free email account and send “whatever”.
Pull out the battery and do not use the phone for any other purpose. It’s best to hide the phone away from your home.
Always start your emails with: “As a proud BLM supporter”.
Just looked.
Flip phone with wifi and email for around $8.50.
You don’t need a cell plan to send emails over wifi.
Still NOT a recommendation.