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Why do I need an ad server? A Practical Guide for Newsletter Publishers Ready to Scale

When you want more manual email advertising setup – control, targeting, and real revenue – it’s time to talk about why you need an ad server.

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Where email and ad tech come together.

Passendo’s blog covers email advertising and newsletter monetization.

We publish practical guides, clear explanations, and grounded analysis for publishers and operators working in email ad tech.

Written for people who take email advertising seriously and want to get it right.

Fresh Reads

Publishers running Lineup can now sell, deliver, and report on newsletter advertising through Passendo without leaving their order management system — including campaigns booked by advertisers themselves.
LiveIntent is a demand network; Passendo is an ad server you run. Compare control, targeting, fill logic, and revenue to choose for you.
AdCP is the open standard for agentic advertising. Here's what Ad Context Protocol means for email publishers — and why it matters now.

Ad Serving & Technology

Technical deep dives into ad servers, delivery logic, and measurement – what to use, how it works, and how to optimize.

AdCP is the open standard for agentic advertising. Here's what Ad Context Protocol means for email publishers — and why it matters now.
What to look for in an email ad server for portals: advertiser control, waterfall logic, triggered email support, and GDPR-compliant reporting.
Email ad serving for listing portals differs from web display in placement, targeting, and control. Here's how it works and why it matters.

Data & Privacy

Practical guides to privacy, consent, and first-party data. Build compliant targeting and reporting for a cookieless world.

As third-party cookies decline, Passendo explores some cookieless targeting solutions & technology, and explains how you can prepare for cookieless advertising.
The cookieless future is reshaping digital advertising. See what it means for tracking, targeting, and how to prepare with first-party data.
Privacy laws are more important than ever - here’s how GDPR and other privacy regulations affect email marketing, and how you can comply with them.

Email Advertising

Guides, playbooks, and examples to plan, sell, and optimize ads in newsletters – formats, pricing, and conversion tactics for publishers.

Email newsletter advertising is one of the most efficient, yet overlooked ways to grow your revenue.
Discover effective email ad formats for publishers. Learn how to use native, banner, video, and dedicated sends to monetize newsletters successfully.
Read Passendo’s guide to maximise your newsletter ROI. Learn how to improve newsletter open rates and increase deliverability.

Industry & Insights

Founder-level takes and research on where email and ad tech are heading – and how publishers should respond.

Publishers running Lineup can now sell, deliver, and report on newsletter advertising through Passendo without leaving their order management system — including campaigns booked by advertisers themselves.
Luke Bussell on why Australian publishers have been sitting on undervalued newsletter inventory for years, and what it actually takes to bring it to market properly.
New research from Passendo and morningcrunch reveals why the German newsletter market is at an inflection point, and what advertisers and publishers need to know now.

Monetization

Guides and strategies to help publishers increase newsletter ad revenue. From pricing and performance metrics to yield optimization, learn how to make every email impression count.

Your portal's price alerts and search digests are untapped ad inventory. Here's how to turn triggered emails into a second revenue channel.
When to invest in email advertising is THE question for any automotive, real estate, travel, or job platform. Here are 6 signals to know.
Transactional email marketing for online marketplaces: how to turn order confirmations, price alerts, and saved search digests into a scalable ad revenue channel.

Product & Solutions

Everything you need to evaluate and use Passendo – feature explainers, real-world applications, and competitor comparisons.

LiveIntent is a demand network; Passendo is an ad server you run. Compare control, targeting, fill logic, and revenue to choose for you.