We do this for two reasons. First sending the link through emailStationery.com’s servers allow us to track the number of clicks and visitors to your website as a result of your emailStationery. We can tell you what links drive the most traffic to your site.
Secondly, by having the links through our site the links can be updated at anytime and every email you sent in the past will point to the new location. If we hard coded the links directly to your website in the stationery and you changed a page, all the emails sent before the page changed would be broken.