Add MailAdx open-time ads to your Mailmodo newsletters
Mailmodo supports custom HTML in email templates. Add MailAdx's ad tag to your Mailmodo campaigns with the subscriber email hash merge tag for open-time ad decisioning.
Why add MailAdx to Mailmodo?
How to integrate MailAdx with Mailmodo
- 1
Create your MailAdx publisher account
Sign up for a free MailAdx account. Create your first ad placement in the Publisher Portal.
- 2
Access Mailmodo's HTML block
In Mailmodo's template editor, add a custom HTML block where you want the ad to appear.
- 3
Add the email hash merge tag
Mailmodo uses mustache-style merge tags for contact properties. Store the SHA-256 email hash as a contact attribute and reference it in the HTML block.
- 4
Paste the MailAdx ad tag and test
Paste the ad tag with your merge tag substituted, send a test, and verify the impression in your Publisher Portal.
Mailmodo editor tips
Mailmodo's template editor supports raw HTML blocks alongside interactive widgets. Place the static image ad below any AMP widgets — MailAdx serves standard HTML images that render in all clients, including those that strip AMP.
<!-- MailAdx ad tag — decision runs at open time -->
<a href="https://mailadx.com/api/v1/serving/click?pub=YOUR_PUB&pk=header&eh={{EMAIL_SHA256}}"
target="_blank">
<img src="https://mailadx.com/api/v1/serving/display?pub=YOUR_PUB&pk=header&eh={{EMAIL_SHA256}}&w=600&h=100"
width="600" height="100" alt="" />
</a>
<!-- Replace {{EMAIL_SHA256}} with your ESP's email hash merge tag -->Mailmodo + MailAdx: common questions
Does MailAdx work with Mailmodo's AMP email format?
MailAdx serves ads via standard HTML image requests — the open-time serving works in both standard HTML emails and AMP-compatible email clients that support image rendering.
How does billing work when I send through Mailmodo?
You pay Mailmodo for email delivery as usual. MailAdx charges only when a subscriber opens and the ad image is requested — not when Mailmodo sends the email. A 10,000-recipient send with a 35% open rate generates roughly 3,500 billable impressions, not 10,000.
Can I use multiple ad placements in one Mailmodo template?
Yes. Create separate ad units in MailAdx (e.g., header, mid-roll, footer) and paste each tag in a different HTML block. Each placement has its own floor CPM and reporting in the Publisher Portal.
Does the Mailmodo integration work on mobile email clients?
Yes. MailAdx serves standard HTML image tags that render in Gmail iOS/Android, Apple Mail, Yahoo, and Outlook mobile. No JavaScript runs inside the inbox — the ad is a plain image request at open time.
Billing with Mailmodo
MailAdx bills publishers a flat platform fee per impression served — typically $0.30–$0.50 CPM — regardless of which ESP you use. Your Mailmodo subscription fee is separate; MailAdx does not charge per send or per subscriber. Advertisers pay you directly (or via programmatic demand) above the platform fee. Top up credits in the Publisher Portal before going live; impressions pause gracefully when credits reach zero.
Troubleshooting Mailmodo + MailAdx
Ad image shows as broken or blank
Confirm the email-hash merge field substitutes in a real Mailmodo test send — not just the editor preview. An empty hash causes MailAdx to skip the auction. Re-send a test to yourself, view the raw HTML source, and verify the eh= parameter is populated.
Impressions not appearing in Publisher Portal
Open the test email in a client that loads remote images (Gmail web, Apple Mail with images enabled). Some corporate Outlook configs block external images by default. Wait 60 seconds and refresh the portal — reporting is near-real-time.
Merge field syntax error in template
Each ESP uses different personalization syntax. Double-check you replaced {{EMAIL_SHA256}} in the MailAdx tag with Mailmodo's exact variable from the setup steps above. A typo in the merge tag will break the URL at open time.
Related resources
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