form-component.ts

onSubmit(name, email, message) {
  this._emailService.sendEmail({
    from: 'Mailgun Sandbox <postmaster@sandboxXXXXXXXXXXXXXXXXXXXXX.mailgun.org>',
    to: email,
    name: name,
    text: message,
  })
  .subscribe(
    () => {},
    err => console.log(err)
  );
}