How to invoke email-ext plugin from Jenkins declarative script?

I am writing a simple Jenkins declarative script to run 'make' and send an email with the result (success/failure).

I can send a simple email using:

post {
    success {
        mail to:"myname@me.com", subject:"${currentBuild.fullDisplayName} - Failed!", body: "Success!"
    }
    failure {
        mail to:"myname@me.com", subject:"${currentBuild.fullDisplayName} - Failed!", body: "Failure!"
    }
}

The resulting email is rather simplistic.

How can I call the email-ext plugin from the script to send an old-style post-build email? (I guess this should use email-ext's groovy-text.template).

I would like to be able to access lists like CulpritsRecipientProvider and to include the tail of the console log.