If you happen to use Gmail, Yahoo, Outlook, etc, do you know these services can read your emails?
If you want to keep your emails only readable by you, Pretty Good Privacy (PGP) is maybe the solution.
Highly recommended, open source and free, PGP is unfortunately not widely supported. However with SimpleLogin most recent PGP support, you can now enable PGP on emails sent to your aliases easily.
Without PGP the emails sent to an alias are forwarded by SimpleLogin as-is to your mailbox, leaving anyone in-between or your email service able to read your emails:
https://simplelogin.io/blog/without-pgp.png
With PGP enabled, all emails arrived at SimpleLogin are encrypted with your public key before being forwarded to your mailbox:
https://simplelogin.io/blog/with-pgp.png
You can find more info on our announcement post on https://simplelogin.io/blog/introducing-pgp/