Blog
Product updates, engineering insights, and email delivery best practices.
How to Set Up SPF, DKIM and DMARC for Your Sending Domain
A step-by-step guide to the three DNS records that authenticate your email: exact SPF, DKIM and DMARC examples, the mistakes that break them, and how to verify them with dig.
Read moreWhy Are My Emails Going to Spam? A Developer's Checklist
Delivered is not the same as the inbox. A checklist of what sends email to spam — authentication, reputation, complaints, bounces, content and volume — and how to diagnose it.
Read moreHow to Choose a Transactional Email API: A Checklist
A vendor-neutral checklist for evaluating a transactional email API: data residency and GDPR, deliverability tooling, webhooks, idempotency, SMTP, pricing, suppression and inbound.
Read moreEmail Bounce Handling with Webhooks: A Developer's Guide
How to handle email bounces and spam complaints with webhooks: classify bounces, verify signatures, process events idempotently and keep a suppression list that protects reputation.
Read moreAutomate SPF, DKIM, and DMARC with HostStack DNS
Stop copy-pasting DNS records every time you add a sending domain. PostStack's HostStack integration publishes SPF, DKIM, DMARC, and return-path records straight into your zone and verifies in seconds.
Read moreRunning an Email API on Managed Postgres: How PostStack Uses HostStack
Why PostStack doesn't run its own Postgres anymore, what stayed self-managed, and what 20 minutes of dump/restore actually bought a one-person team in operating overhead.
Read moreThe EU Email Stack: Why Your DNS and Database Provider Matter Too
GDPR doesn't stop at the email row. The four places EU data residency usually leaks — DNS, database backups, object storage, operational tooling — and how an end-to-end EU email stack closes them.
Read moreSelf-Host Email vs Use an API: A Decision Framework
When does rolling your own Postfix make sense, and when are you about to set €500/month of operator time on fire? Five variables, two clear-win scenarios, and the hybrid pattern most teams converge on.
Read moreGDPR-Compliant Email API in 2026: A Buyer’s Guide
What "GDPR-compliant email API" actually means in practice, the four traps US-hosted providers fall into, and a buyer’s checklist your DPO will recognise.
Read more