Since taking over Newsletter Glue in April 2025, we’ve been laser-focused on improving functionality that publishers rely on every day. Automations are right at the top of that list.
This one was personal for us. At PaywallProject, we work with 100+ publishers who run newsletter automations daily. We see exactly what happens when an automation doesn’t fire properly. Missed sends. Duplicate sends. Missing content. Angry readers. It’s frustrating.
That reality shaped the work behind Newsletter Glue 4.0.6.
This release represents months of focused effort on automation reliability, new ESP integrations with HubSpot and BigMailer, and OAuth improvements. A lot of refactoring, testing, and validation across different publisher setups and real-world workflows.
Juan, our lead developer, has been at the center of this effort, working alongside the entire team. We put in countless hours testing edge cases, validating real-world automation scenarios, and ensuring connections behave consistently over time. Our goal is simple: make Newsletter Glue the most dependable newsletter solution for publishers.
How we approached testing
WVLegals.com from the West Virginia Press Association is a powerhouse user of Newsletter Glue Automations. They automatically deliver more than 50 automated newsletters, with posts from specific categories, to various subscribers, at around the same time every morning.
With the new polling-based approach in 4.0.6, Newsletter Glue uses a single event cron to check whether a newsletter is due to be sent based on the parameters set for each automation. Instead of dozens of scheduled events for each newsletter, we have one.
So how did it go?
For good measure, we relied on traffic-based WordPress cron triggering for WVLegals.com and scheduled more than 50 newsletters at around the same time. Despite erratic site traffic, each newsletter was properly fired. No double sends, no empty content, and no missed sends.
That gave us confidence that the single recurring cron approach behaves reliably under real-world load.
What’s next?
Three major items are on our to-do list:
We’re building a calendar block to easily bring event data into your newsletter from your favorite events calendar plugin. It’s worth noting that our PaywallProject team built a fully automated AI-powered events calendar that automatically populates event data from within your community straight into your preferred calendar. You can check it out here.
We are aggressively adding new ESP integrations. Since the beginning of 2026, we’ve added Omeda, BigMailer, and HubSpot, with more to come! Are we missing your favorite ESP? Please tell us who you’d like us to integrate with next.
And last but not least, we are preparing to launch our very own ESP this year, built specifically for Newsletter Glue. If you’re interested, we’d love to hear from you.
That’s enough for now. Happy newsletter building.