I once decided to show the vulnerability of SMTP protocol by sending an email as a higher-up. (Too young, too naive, don't ask why I did that.) Created a massiv

I once decided to show the vulnerability of SMTP protocol by sending an email as a higher-up. (Too young, too naive, don't ask why I did that.) Created a massive firestorm. I did successfully convert them to use SPF and DKIM and showed everyone the need to never trust an email. Some even adopted PGP signatures after that.