We're tempted to try this site as a way to securely distribute a newsletter. Things have changed since last we ran this thing. Thanks to Edward Snowden, we know more about 'by how much'.
We all need to be secure and free. Ordinary webmail services put a draconian clamp on Bcc mail. A lot of that mail is truly unsolicited. Turning over an address list to a webmail service is tantamount to outing everyone on that list.
Substack promises to be free and secure. We shall see how close they come to their purported goal.