pipeline {
  agent any
 
  stages {
    stage ('init') {
      steps {
        echo 'Hello World'
      }
    }
  }

  post {
    always {
      script {
        echo 'echo step before emailext step'
        emailext(subject: 'Test email', to: 'invalid@invalid.com')
      }
    }
  }
}

  post {
    failure {
      script {
        ...
      }
    }
    always {
      script {
        ...
        if (...) {
          echo 'Keeping this build forever and sending specific email notification with build report...'
          ...        
          emailext(subject: '... Recovery Build Report', to: toEmails, attachLog: true, body: htmlBody, mimeType: Constants.CONTENT_TYPE_TEXT_HTML)
        } else {
          ...
        }
      ...