Common Newsletter Email Unique IDs
When serving email ads, a Email User ID macro (EUID) is required for proper functionality. This macro must be provided by your newsletter service and must distribute with a unique ID for each recipient. Our list of known newsletter provider macros are shown below.
List of Known Newsletter EUID macros
<span class=eloquaemail>EmailAddress</span><span class=CampaignId>CampaignId</span>