[Paul M]

From the vb bitfields list you can see that the adminemail option value is 16 ;

<group name="useroptions">
	<bitfield name="showsignatures">1</bitfield>
	<bitfield name="showavatars">2</bitfield>
	<bitfield name="showimages">4</bitfield>
	<bitfield name="coppauser">8</bitfield>
	<bitfield name="adminemail">16</bitfield>
	<bitfield name="showvcard">32</bitfield>
	<bitfield name="dstauto">64</bitfield>
	<bitfield name="dstonoff">128</bitfield>
	<bitfield name="showemail">256</bitfield>
	<bitfield name="invisible">512</bitfield>

So you need to do a logical AND of the useroptions value and 16 - and test the result.