How Spamhaus blocklisted my SMTP verifier — a server that never sent an email
In short: I'm building an email verification service that works via live SMTP probing. One day iCloud started rejecting my server with 550 ... rejec…
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Build a Terraform provider for your side project's API (it's smaller than you think)
Writing a Terraform provider sounds like a big-company activity, something HashiCorp partners do with a team and a roadmap. In practice, if your API…
Outlook.com Is the Final Boss of 'Just Send an Email'
Every email project starts with a lie: "I'll just test it with SMTP real quick." That was my plan while working on EpicMail . I wanted a boring, rep…
Open Source Email Server Setup: The 2026 Infrastructure Guide
The Definitive Guide to Self-Hosted Email Infrastructure in 2026 Why would anyone self-host email in 2026? AWS SES, SendGrid, Mailgun, and Postmark…
KumoMTA vs PowerMTA: The 2026 Enterprise Email Infrastructure Comparison
KumoMTA vs PowerMTA: The Definitive Guide to Enterprise Email Delivery in 2026 When your platform sends 10 million transactional emails a day, the d…
How to Set Up KumoMTA: A Complete Guide for High-Volume Email Senders - Updated 2026 Guide
How to Set Up KumoMTA: A Complete Guide for High-Volume Email Senders KumoMTA's combination of open-source licensing and modern architecture makes i…
Email Authentication Dkim Spf Dmarc - Updated 2026 Guide
Bounce Rate Reduction: The Complete Technical Guide for Email Engineers Bounce rate is the silent killer of email deliverability. A rate above 2% ge…
Bounce Rate Reduction Guide - Updated 2026 Guide
Bounce Rate Reduction: The Complete Technical Guide for Email Engineers Bounce rate is the silent killer of email deliverability. A rate above 2% ge…
Bounce Rate Reduction: The Complete Technical Guide
Bounce rate is the silent killer of email deliverability. A rate above 2% gets you flagged. Above 5% gets you blocked. Most teams don't know they ha…
KumoMTA Setup Guide: From Zero to Production Email
KumoMTA's combination of open-source licensing and modern architecture makes it an attractive choice for teams ready to move beyond legacy MTA solut…