That is a good tip, I will try to see if my email provider has that. In the mean while I know that I can just hover over the senders name.

But back to my question to Dan who was talking about outdated certificate technology on this web site being related to spam:

How does certificate security stop scammers impersonating people on email? Unless the site also requires everyone to create an account and create a username that is not their real name. And demands that communication is only ever done within the platform like your site or PCF.