.onion address for Tor Browser: https://5yfi ... 4sqd.onion
Tor .onion requires SSL certificates to be manually accepted.
With Tor .onion email messages can only be sent to other XMail.net accounts.
Thunderbird is a free email application for Desktop: Download Thunderbird
Fully featured, privacy oriented email app for Android: FairEmail
Download FairEmail from: Google Play, GitHUB, F-Droid
Open source email client for Android: K-9 Mail
Download K-9 Mail from: Google Play, GitHUB, F-Droid