Table layouts for html email

[Jopet§]

I'm trying to build a html email and it's going okay apart from this inner table which I'm trying to make into a rounded box. The table and cells are set to have a width of 410px combined but the table has decided to assume a width of around 453px. I don't know why this is when its parent cell is only 410px wide. Here is the link:http://seedetail.co.uk/html_email/email.htmlThe orange boxes are done as a single image for simplicity but the white one will be 1100px so it's not practical. I'm not really up on tables for layout because it's normally bad practice in browsers so I'm kind of struggling here.I know that float, clear, padding, margins are not really supported in a lot of email programs so this makes it quite difficult to deal with.