S/MIME email signature and encryption for G Suite for Education

S/MIME has recently become available for G Suite for education. This offers digital signage of emails and enhanced encryption where supported by the recipient. There are a few steps to setting this up.

Enable on the Admin Console for users
Generate pfx certificates for users (or get them to do it)
Upload pfx into GMail settings - either the user does this or you can do it with GAM
GAM command: gam user jim@acme.com add smime file jim.pfx password p@ssw3rd default
The password is for the certificate - not the user's password.
Optionally force the use of S/MIME via a content compliance rule for certain recipients.

Useful links:
GM Commands
Commodo - one source of certificates
How to make a pfx

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