When serving email ads, you need to add the correct Email User ID (EUID) macro to your email ad zone tag. This macro is provided by your newsletter service or email platform.
Below are the macros for some of the most popular email platforms.
Most Popular
INDIE EMAIL
%25SUBSCRIBERID%25%25MESSAGEID%25%25UNIQUEID%25
MAILCHIMP
*|CAMPAIGN_UID|*-*|UNIQID|*
Other Platforms
ACTIVE CAMPAIGN
%SUBSCRIBERID%%MESSAGEID%
ADESTRA
$AMF_UNIQUE$
EMMA
[[__member_id__]][[__mailing_id__]]
HUBSPOT
{{contact.firstname}}{{contact.hs_object_id}}
MAILPOET
[subscriber:email][date:d][date:m][date:y][newsletter:number]
ORACLE ELOQUA
<span class=eloquaemail>EmailAddress</span><span class=CampaignId>CampaignId</span>
PARDOT
{{Recipient.ID}}{{Current_Day}}{{Current_Month}}{{Current_Year}}
SAILTHROUGH
{{emailnum}}{{time()}}
SENDGRID
-customer_id--date--time--
ZOHO
$[EMAIL]$_$[UD:ADBUTLER_UNIQUE|AB_UQ|AB_UQ]$