deleting record from mysql data base

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PHP

hi,
I have a table which contains fname,lname and email addres and dynamically added check box field too.
Once i checked the check box and then press delete button the relevent record should be deleted.
I tried as follows.

<?php
if(isset($_POST['deleteAcc']))//delete button
{
      $getEmail = "SELECT * FROM user";
      $getEmailResult = mysql_query($getEmail);
      while($r = mysql_fetch_array($getEmailResult))
      {
       $email = $r['email'];
       if(isset($_POST[$email])!=NULL)//check box
       {
           $deleteUserQuery = "DELETE FROM user WHERE email='$email'";
           $deleteUserQueryResult = mysql_query($deleteUserQuery);
           header('Location:admin.php');
       }
      }
}
?>

above code will properly work when email something like 'abc'.but it does not work when email like 'a@b.c'.

help me!
thank you.