Blog
Notes from the team running the operating system.
Original analysis from customer data, practitioner interviews, and the opinions we form running the platform.
Latest
most recent 8November 3, 2026Why Gmail Clips Your Newsletter (and How to Stay Under 102KB)Gmail cuts off emails with more than about 102KB of HTML, hiding your last stories and your unsubscribe link. What makes newsletters heavy and how to slim them down.NotesNovember 3, 2026Hard Bounce vs. Soft Bounce: What Each One Does to Your ListA hard bounce means the address is gone for good; a soft bounce means try again later. What causes each, what to do about them, and how to keep bad addresses off your list.DeliverabilityNovember 3, 2026Best Beefree alternatives for newsletter design in 2026Compare Beefree alternatives for newsletter design in 2026. Choose Letterhead for publishing workflows, or an email editor for design-only needs.ProductionNovember 3, 2026Best Beehiiv alternatives for media companies in 2026The best beehiiv alternatives for media companies: Letterhead for publisher workflows, Ghost for owned publishing, and Substack for paid newsletters.NotesNovember 3, 2026Best content curation tools for newsletters in 2026Compare newsletter curation tools by editorial job. Letterhead fits website-based teams; see where Feedly, Inoreader, alerts, and bookmarks fit best.ProductionNovember 3, 2026Best email deliverability tools in 2026Compare the best email deliverability tools for newsletters, inbox testing, authentication, and reputation. Choose tools that diagnose your actual problem.DeliverabilityNovember 3, 2026Best Mailchimp alternatives for publishers in 2026The best Mailchimp alternatives for publishers in 2026: compare editorial workflows, paid subscriptions, audience growth, and automation before switching.NotesNovember 3, 2026Best newsletter A/B testing tools in 2026Compare the best newsletter A/B testing tools. Mailchimp leads for routine editions; use the workflow checklist to choose the right fit for your team.Analytics
Results
searching all 177 postsNo posts match that yet.Try a broader term — “deliverability”, “sponsorship”, “open rates”.
Get the Letterhead newsletter.
Original analysis on newsletters, weekly. From the team that runs the operating system.