If you would like a secure Kastler.net email address, they are available for free. There is a web-based interface, as well as the ability to add the email address to any email software. There’s built-in anti-spam and anti-virus that can be adjusted. A new interface was recently released (2020) which brings a fresh modern look to the webmail system. Please contact me via the contact form to request your email address and we’ll get you set up.