Images in Email Templates

I'm trying to link an image in an email template from ImageShack. The size of the image is 1496x3758. When I import the image, I put those dimensions into the link image box where the URL is pasted. 

Regardless of the dimensions entered, upon saving the Email Template, the image is resized to 1200x1200. Is there a way to work around this?

Thanks,

Edit: Fixed - Used only one of the dimensions, not both. Also put it in a 1x1 Table seemed to anchor it better in the email.