Page Rendering API to send email with template

gistfile1.groovy

grails.gsp.PageRenderer groovyPageRenderer
void welcomeUser(User user) {
    def contents = groovyPageRenderer.render(view:"/emails/welcomeLetter", model:[user: user])
    sendEmail {
        to user.email
        body contents
    }


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new File("/path/to/welcome.html").withWriter { w ->
    groovyPageRenderer.renderTo(view:"/page/content", w)
}