Many years ago, I've been working on similar (but better ?) SMTP security device [1], that was doing on-the-fly email encryption by catching outgoing SMTP conne

Many years ago, I've been working on similar (but better ?) SMTP security device [1], that was doing on-the-fly email encryption by catching outgoing SMTP connections and encrypting their content. One only had to setup some keys and stick in in the outgoing network and it worked - like PGP, but without the need to setup it on every device. But, they are already out of business now... [1] https://www.scmagazineuk.com/securecoms-launches-sme-encryption-products/article/562199/ https://www.scmagazineuk.com/securecoms-launches-sme-encrypt...