Customize the email ad unit

Since the ads are requested server-side, you can take the JSON response and insert it into the email as you compile it, enabling the ad unit to take on any form.


Incorporate user-level targeting

Use Adzerk's UserDB to store first-party user data, and then include targeting rules when requesting ads to ensure that each ad is relevant to that particular user.


Ad decisions handled for you

We can take tens of thousands of email ads and choose the best one in milliseconds based on targeting, revenue goals, and more. Building this in-house could take years.

email ads

Adzerk's flexible APIs make it easy to build the exact email ad server you want, in 90% less time than building it from scratch.

Think of Adzerk like a box of Legos: our server-side infrastructure tools let you build, test, and tweak any ad server - with flexibility around pricing, look/feel, targeting, pacing, and much more.

Test the API

Built for developers. Trusted by enterprises.

Keep building an awesome core business while staying confident Adzerk can support your email ad server.

99.99% API Uptime

We’ve been doing this for a decade - we know how to keep the system running

Fast Response Times

Adzerk is all about speed at scale. We can get as low as 50ms response times, even while handling 3B daily requests

Dev Support On Deck

You’ll be teamed with support engineers, software engineers, account managers, and a Slack channel

GDPR Compliance

Our tools are 100% GDPR compliant by default - no need to worry about non-compliance

Enterprise Security

We've got SOC 1 (SSAE 16) certifications, VPCs, and more



Ready to build an email ad server?

Adzerk is scalable, fast, and always picks the right promotion to show. They are easily the leading solution in the market.
David Han, VP of Product, Ticketmaster

Learn how Adzerk can help you build your own ad server in weeks, not years

Sign-up and start building