Tutorials, guides, and insights on PowerMTA, email infrastructure, and cloud server management.
Cold promotion is more than blasting emails. It is a system of targeting, sequencing, and measuring. Here is how to build a cold promotion engine that converts, and how Choco Mailer powers it on your own server.
Cold email still wins in 2026 when it is done right. Learn what separates promotions that land in the inbox from ones that vanish into spam, and how a self-hosted setup gives you full control over deliverability.
Using a single PowerMTA config for all domains is a critical mistake. Learn how to configure Virtual MTAs to isolate sending reputation, separate transactional from marketing mail, and prevent one bad domain from killing all your IPs.
Gmail, Yahoo, and Microsoft now require bounce rates under 2%. This guide shows you how to configure PowerMTA's bounce processing, automate suppression, and keep your sender reputation clean.
If your emails suddenly stop getting delivered, your IP might be blacklisted. This guide explains how to check DNSBL listings, why they happen, and how to fix them.
New IPs have zero reputation. If you blast thousands of emails on day one, you'll end up in spam or get blocked entirely. This guide shows you how to warm up IPs properly in PowerMTA.
Can't send email? The problem might be a blocked port or a broken SMTP connection. This guide shows you how to test SMTP on ports 25, 465, and 587 using simple tools.
Sending all your email from one IP is risky. This guide shows you how to set up IP rotation in PowerMTA using virtual MTAs to spread volume and protect your sender reputation.
Brand new to PowerMTA? This beginner-friendly tutorial covers everything from picking a server to sending your first email. Written for people who have never touched an email server before.