As of 7.5.0, you can send out mass emails with a promotional code using the following format: [websiteURL]?promo=[code].
In order for the promotional code to apply, the website URL has to be a product listing or a product detail page. It will not work for just any page in the website. For example, "http://apa3.personifycloud.com/personifyecommerce/Store/NewReleases.aspx?promo=BOOKS2013". If the web user clicks this link and adds product(s) to his/her cart, the promotion is added.
Please note that the promotional code is specific to a browser session until it is attached to a product that is added to the cart. This promotion does not need to relate to discounts and can be used for tracking purposes only to monitor how effective your marketing campaign is.