Common Newsletter Email Unique IDs
When serving email ads, an 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>