Connecting MailAdx to Klaviyo
Klaviyo is a popular ESP for e-commerce and DTC brands, with powerful audience segmentation and flow-based automation. Integrating MailAdx with Klaviyo uses the same open-time pattern as Mailchimp: add a profile property for the email hash, paste the ad tag, and MailAdx runs the waterfall when subscribers open — for both campaigns and flows.
Step 1: Add the email_sha256 profile property
In Klaviyo, create a profile property email_sha256 containing the SHA-256 hex hash of each subscriber's lowercase email. Populate it via CSV import, API, or a flow action before sends go out.
Step 2: Paste the ad tag
In Klaviyo's template editor, add a Custom HTML block where the ad should appear. Paste the ad tag from Dashboard → Ad Units, using {{ person.email_sha256 | default:'' }} as the hash parameter in the display and click URLs.
Step 3: Flows and campaigns
The same ad tag works in one-time campaigns and automated flows without changes. Because the ad decision runs at open time, subscribers who open a flow email days after it was sent still receive a current, relevant ad — not a stale creative frozen at send time.
Conclusion
Once configured, open-time ad serving works automatically for all Klaviyo campaigns and flows. See the full guide at Klaviyo integration docs, all ESP integrations, or contact our team for integration support.