the value stored in the database will be the value of the radio button.
in your example:
<input type=radio name="Receive_Email" value="Y" >
Yes
<input type=radio name="Receive_Email" value="N" >
No </td>
you have the value set to "Y" or "N", to Store Yes or No, change the value to yes or No:
<input type=radio name="Receive_Email" value="Yes" >
Yes
<input type=radio name="Receive_Email" value="No" >
No </td>