We have a use case that our users uses Google sso.
When a user from a specific domain have signed in for the first time the administrator wants an email so we can set permissions on the user. We have Amazon ses och smtp.google.se.
I have found, https://auth0.com/rules/sendgrid, but this does not really help for Amazon ses/smtp.google.se
An alternativ workflow would be to have a invite only workflow but i have not found any thing in conjunction with Google SSO.