Monetize your MailerLite newsletter with open-time ads
MailerLite supports custom HTML blocks in email campaigns. Add MailAdx's open-time ad tag to your MailerLite templates using subscriber personalization for email hashing — monetize without changing your sending workflow.
Why add MailAdx to MailerLite?
How to integrate MailAdx with MailerLite
- 1
Create a MailAdx publisher account
Sign up at mailadx.com/signup and create an ad placement in the Publisher Portal.
- 2
Add a custom HTML block in MailerLite
In MailerLite's drag-and-drop editor, add a Custom HTML block where you want the ad to appear. Switch to code view to paste the MailAdx ad tag.
- 3
Configure the email hash merge tag
MailerLite supports subscriber personalization via {$subscriber_hash} or custom fields. Store the SHA-256 email hash as a custom subscriber field and reference it in your ad tag URL.
- 4
Send a test campaign and verify
Send a test email to yourself, open it, and confirm the ad loads. Check the Publisher Portal for the impression.
MailerLite editor tips
MailerLite's editor has a 'Custom HTML' block under Advanced. For the new editor (2024+), click '+' → 'Custom HTML'. Automation emails use the same template blocks as campaigns.
<!-- 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 -->MailerLite + MailAdx: common questions
Does MailAdx work with MailerLite automations?
Yes. Paste the ad tag into any MailerLite email template — campaigns, automations, or RSS-to-email sends. The ad decision runs at open time regardless of how the email was triggered.
How does billing work when I send through MailerLite?
You pay MailerLite for email delivery as usual. MailAdx charges only when a subscriber opens and the ad image is requested — not when MailerLite 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 MailerLite 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 MailerLite 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 MailerLite
MailAdx bills publishers a flat platform fee per impression served — typically $0.30–$0.50 CPM — regardless of which ESP you use. Your MailerLite 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 MailerLite + MailAdx
Ad image shows as broken or blank
Confirm the email-hash merge field substitutes in a real MailerLite 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 MailerLite'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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