Can you provide an example of the URL for the page, the page contents (as seen if fetched directly from the web site) and what it ended up as in the email you received in the end?
(Possibly submitted in the form of a support case http://world.episerver.com/Support/Register-Support-Incident/)
I create new Mailing and select EPiServer CMS page as HTML Source. When I preview e-mail or send it to test recipient, all references to resourses (css, js) as well as images are wrong.
f.e. /url to the selected for sending page//CSS/layout.css
or http://hostname/url to the selected for sending page//images/logos/logo.png
How to configure e-mail layout to exclude page name from reference to resources?