Passendo is a global email ad server and audience monetization platform built for premium publishers. Founded in 2016 by two digital advertising experts, our award-winning technology powers in-email advertising for publishing houses across North America, Europe, Australia, and beyond. Unlike generic ad tech solutions, Passendo is purpose-built for the operational complexity of email inventory. Publishers get full control over their campaigns, advertiser selection, and first-party data, with server-side tracking that keeps them as the sole data controller. No third-party pixels. No consent risk. The platform combines direct-sold campaign management across CPM, CPC, and CPA models, programmatic backfill, A/B testing, native and display ad formats, and real-time reporting in a single environment. Passendo reduces manual campaign management work by up to 80%, helping premium publishers build sustainable, growing revenue streams from an existing, high-engagement channel. This is not a self-serve tool. Passendo is a professional-grade platform for publishers who take email inventory seriously and want a partner that matches their standards.