Borders are showing up in email that was sent even though borders set on 0

I'm having the same problem where borders are showing up on sent emails that are not showing up on my draft of the same email OR in preview - but they do when I send a test email.  The border is set on 0.  I have tried turning on borders and get different colors in different places???  This cannot be an Outlook problem as I read on a previous post. If it was an outlook issue then it would happen on all Constant Contact emails that I receive from other senders.  So how do I remove the lines that appear and make the email that was sent look very unprofessional?  I used a template in the Constant contact templates and modified it as my own.