I can't seem to get the the right border to display in Gmal. It shows up on the other three sides.

Here is the code I am using:

< table class="email-table" style="margin: 0px auto; width: 600px; display: block; border: 1px solid #6a6a6a;" border="0" cellspacing="0" cellpadding="0" align="center" bgcolor="#ffffff" >

What am I doing wrong? This problem is only presenting itself on Gmail and AOL (FIrefox).

Any help would be greatly appreciated!