mysql> describe replies;
+---------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------+----------------+
| id | int(11) | | PRI | 0 | auto_increment |
| email | varchar(50) | YES | |
+---------+-------------+------+-----+---------+----------------+
11 rows in set (0.00 sec)
mysql> SELECT email FROM replies WHERE email IS NOT NULL;
//-------selects perfectly here, not showing null fields
try it at the mysql prompt, perhaps?