How do I send my email certificate to someone so they can encrypt emails they send to me?

When you first receive your email certificate, you will need to distribute the Public Key to the people you want to send encrypted emails to.

When you send them an email, digitally sign it to attach the Public Key certificate. They must store your email address with the certificate in their address book. After this, they can encrypt each email that is sent to you by setting it up in the Security Options.