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

MailChimp

*|CAMPAIGN_UID|**|UNIQID|*

SailThrough

{{emailnum}}{{time()}}

Emma

[[member_id]][[mailing_id]]

SendGrid

-customer_id--date--time--

RealMagnet

message_id

Adestra

$AMF_UNIQUE$