i added links for an ad campaign (AdJuggler ad server) to an email. They work properly in the preview, but not in the test email. I've added the <cm_dontconvertlink>. Here is an example of the link:
<a href="http://rotator.adjuggler.com/servlet/ajrotator/458707/0/cc?z=adcision&session=no&ajkey=" cm_dontconvertlink>
Hi, I just checked that link and it redirects to a page with the txt "Banner Expired". I'd get in touch with your ad provider, that looks like the problem here.