function checkEmail(email) {
 if (email.length<6) {

    alert('Your email is too short.');
    return false;

 }
 
  if (email.length>150) {
  
    alert('Your email is too long.');
    return false;

 }

 if (email.indexOf('@')<0) {
 
    alert('Your email has no @ in it.');
    return false;
 
 } 

 if (email.indexOf('.')<0) {
 
    alert('Your email has no dot in it.');
    return false;

 }
 
 if (email == 'name@domain.com') 
 
 {

    alert('Please enter a valid email.');
    return false;

 } 


 return true;

}