Add programmatic and direct ad revenue to your Mailchimp newsletter
MailAdx integrates with Mailchimp via a standard HTML content block and the *|EMAIL_SHA256|* merge tag. Monetize your Mailchimp audience with open-time ads — no webhooks required.
Why add MailAdx to Mailchimp?
How to integrate MailAdx with Mailchimp
- 1
Create your MailAdx publisher account
Sign up at mailadx.com/signup and get approved (up to 24 hours). No credit card required.
- 2
Create an ad placement and copy the ad tag
In the Publisher Portal, create a new Ad Unit. Set your floor CPM and format. Copy the generated HTML ad tag.
- 3
Ensure the EMAIL_SHA256 merge tag is available
Mailchimp provides *|EMAIL_SHA256|* as a built-in merge tag — no setup required. This substitutes each subscriber's hashed email when the send is processed.
- 4
Add an HTML content block to your Mailchimp template
In the Mailchimp email editor, drag a Code block (or Custom HTML block) into your template where you want the ad. Paste the MailAdx ad tag, replacing {{EMAIL_SHA256}} with *|EMAIL_SHA256|*.
- 5
Preview and test
Use Mailchimp's preview with a real subscriber record to confirm the merge tag substitutes correctly. Send a test to yourself, open the email, and verify the ad loads in your Publisher Portal.
<!-- 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 -->Mailchimp + MailAdx: common questions
Does MailAdx replace Mailchimp Ads?
MailAdx is a replacement for Mailchimp's passive ad network for publishers who want more control. You own the advertiser relationship, set your own floors, and access programmatic demand beyond Mailchimp's marketplace.
Which Mailchimp plans support HTML blocks?
Custom HTML blocks are available on Mailchimp's Essentials, Standard, and Premium plans. The free plan has limited template customization — check your plan's template editor for the Code block option.
Ready to monetize your Mailchimp newsletter?
Free to start. No revenue share. Direct advertiser relationships from day one.