Hey t= here =F0=9F=91=8B,

March = was a big month. The Bulk API is now available, we completed a major infras= tructure migration under the hood, and we're heading to Portland next month= for MicroConf. Plus, a customer story about how Postmark saved a business = overnight. Let's get into it.

Shipped

=

Bulk API is now available

As we= mentioned earlier this month, the Bulk API is here. Define your message co= ntent once, pass a list of recipients, and Postmark compiles and delivers t= he individual messages on our end. One API call, thousands of emails, and d= ramatically smaller payloads. We'll even handle send-speed optimization so = your messages land in the inbox.

It's = available to all Postmark customers! Just contact our support team to get it enabled for your accou= nt, then check out the API documentation to get started.

Alrea= dy using it? We'd love your feedback. Share your tho= ughts here.

Learn more about the Bulk A= PI

We migrated our email infrastructure to KumoMTA

We co= mpleted a migration from our previous MTA to KumoMTA, a modern open-source = mail transfer agent. The result? Faster queue processing, improved delivery= performance across major inbox providers like Gmail, Yahoo, Microsoft, and= Apple, and a foundation that gives us more flexibility to keep improving t= hings.

= Read the full story on our blog

Customer spotlight

This = month we're featuring Alex Kravets, CEO of 100Hires, an applicant tracking system featured by Forbes as the be= st ATS for SMBs and startups. When their previous email provider shut them = down overnight, Postmark got them back up and running the same day. Here's = his story.

How would you describe yourself in one sentence?

CEO o= f 100Hires, an applicant tracking system featured by Forbes as the best ATS= for SMBs and startups

Can you tell us a little bit about your experience and the work= you do?

I'm t= he founder and CEO of 100Hires, an ATS (Applicant Tracking System) that hel= ps recruiting teams manage candidates, schedule interviews, and collaborate= on hiring decisions. We serve thousands of teams worldwide, and reliable t= ransactional email is the backbone of our product.

How has Postmark helped you?

Postm= ark literally saved our business overnight. Our previous email provider =E2= =80=94 a large, well-known competitor =E2=80=94 automatically disabled our = account without warning over a routine address change. Thousands of our use= rs suddenly stopped receiving interview invitations, candidate notification= s, and password resets. For an applicant tracking system, that's a complete= service outage. We integrated Postmark and had emails flowing again the sa= me day. Since then, we've never had a single deliverability issue. Postmark= gave us back the peace of mind that our most critical infrastructure just = works.

How are you using Postmark on your projects today?

Postm= ark is the backbone of all transactional email at 100Hires. We send intervi= ew scheduling notifications, candidate status updates, team collaboration a= lerts, password resets, and account confirmations =E2=80=94 all through Pos= tmark. We've built a deep integration: we use Postmark's webhooks to track = deliveries, bounces, opens, and spam complaints in real time. We have autom= ated systems that detect inactive addresses flagged by Postmark and clean t= hem from our database. We also run delivery monitoring that alerts us to an= y bounce or complaint patterns. It's not just "plug in and send" =E2=80=94 = Postmark is deeply woven into our product's reliability layer.

What advice would you give other folks in your role about imple= menting and managing their email?

Two t= hings. First, never rely on a single email provider for mission-critical tr= ansactional email =E2=80=94 we learned this the hard way when our account w= as disabled out of the blue. Always have a backup integration ready to swit= ch to. Second, choose a provider whose entire business is transactional ema= il, not one where it's a side feature next to marketing campaigns. Postmark= 's focus on deliverability and their developer-friendly API made our emerge= ncy migration possible in hours, not weeks. Also, invest in webhook integra= tion from day one =E2=80=94 tracking bounces and complaints proactively sav= es you from finding out about delivery problems from angry users.

Built something cool with Postmark lately?
We'd love to feature you in our Customer Spotlight!

Come see us at MicroConf= in Portland!

We're= heading to MicroConf = US in Portland, Oregon, April 12=E2=80=9314. It's the original conferen= ce for bootstrapped and indie SaaS founders. It's an intimate gathering of = around 250 people who are building profitable businesses without the ventur= e capital playbook. If you're attending, come say hi. We'd love to chat abo= ut what you're building and how your email is working for you.

Our latest, greatest fin= ds from around the web

Claude Code's hidden features, exposed

Claud= e Code's source code was accidentally leaked via an npm source map, and som= eone built a site cataloging its hidden features. From unshipped feature fl= ags to secret slash commands and an "autoDream" memory consolidation system= . Fascinating peek under the hood of an AI coding tool. Explore the findings

Paperclip: Hire AI Agents Like Employees (Live Demo)

A dee= p dive into how AI agents can be organized to work together: planning, dele= gating, and coordinating like a team. Worth a watch if you're thinking abou= t where agentic workflows are headed. Watch on YouTube

MicroGPT: Build a GPT from scratch

Andre= j Karpathy distilled a complete GPT into ~200 lines of pure Python... no li= braries, no frameworks. This interactive visual guide by James Tauber break= s it down step by step with diagrams and animations. The best way we've see= n to understand how transformers actually work. Work through it

Meme of the month

Newsletter complete. See you next month!

Keep building amazing things,

The Postmark Team

P.S. Want to share your project? If you've built something with Postm= ark that solves a real problem for real people, we want to feature you. Tell us about it or just reply to this email.