Category
9 articles in Transactional & SMTP.
Transactional email — receipts, password resets, notifications — runs on different infrastructure and different rules than marketing campaigns. This collection covers the plumbing: SMTP ports and authentication, relays and APIs, error codes and timeouts, dedicated sending domains, and the monitoring that catches delivery problems before your users do. Practical, developer-friendly guides for anyone responsible for email that has to arrive.
The nine transactional email templates every product needs, with copy examples for password resets, receipts, failed payments, and shipping notices. Includes a transactional vs. marketing comparison table, sending-stream separation advice, variable-naming rules, and a pre-launch QA checklist.
How to choose the best email API in 2026 without getting lost in feature checklists. Covers the eight evaluation criteria that actually predict deliverability, the four categories providers fall into and their tradeoffs, how to read API docs like an engineer, a REST-versus-SMTP comparison table, and a safe migration sequence.
A transactional email is a one-to-one message triggered by a user action. Here is how it differs from marketing email, 16 examples to audit your product against, the SMTP ports and DNS records you need, and where promotional content crosses the line.
SMTP uses ports 25, 465, 587, and 2525. Here's what each port does, how they handle encryption, and which one to use when sending email.
The exact Gmail SMTP settings (smtp.gmail.com, ports 587/465) plus step-by-step instructions to create an App Password and start sending.
SMTP is the internet standard for sending email. This beginner's guide explains what SMTP does, how a message travels, and how it differs from IMAP and POP3.
An SMTP relay forwards your outgoing email through trusted servers so it reaches the inbox. Learn how relays work, how they differ from direct delivery, and when to use one.
How SMTP relay services deliver your email, and the concrete criteria to evaluate one: authentication, IP reputation, own-domain sending, reporting, and pricing.
Transactional emails are triggered by a user's action; marketing emails promote to a list. Here's the difference in purpose, consent, deliverability, and design.