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Email API, deliverability, and QA engineering blog - Page 20

Tactical writing for teams building reliable email and SMS workflows in development, CI, and production operations.

Page 20 of 27334 posts

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technical

What kinds of headers should I set to make a website secure?

How can content security policies and X Frame Options enable more secure websites and services.

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technical

What Is SMTP? Protocol Basics, Commands, and Modern Email Delivery

SMTP (Simple Mail Transfer Protocol) is the internet standard for email submission and transfer. Learn commands, ports, and where SMTP fits in modern stacks.

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technical

What Is SMS Authentication? Security Tradeoffs and Safer MFA Design

SMS authentication uses one-time codes sent by text message. Learn how it works, where it fails, and how to design safer MFA flows.

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technical

What Is Single Sign-On (SSO) and How Does It Work?

Understand SSO architecture, user/session flow, and the security tradeoffs of centralizing authentication across applications.

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technical

What Is SAML? Identity Federation and SAML SSO Explained

Learn what SAML is, how SAML assertions work, and when to choose SAML vs OIDC for enterprise single sign-on integrations.

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technical

What is Multi-Factor Authentication (MFA), and How Does it Work?

Multi-Factor Authentication: Why it's Critical for Your Online Security - Learn about the benefits and methods of MFA to protect your digital identity.

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technical

What Is MMS Messaging vs SMS? Practical Differences for Product Teams

Compare MMS vs SMS for delivery reliability, cost, payload type, and use-case fit. Learn when to use each in production workflows.

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technical

What is an Email Newsletter, and How to Create One?

Create an Engaging Email Newsletter for Your Business: Learn the Benefits, Pros & Cons and Step-by-Step Guide to Craft Successful Newsletters.

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technical

What Is a Webhook? Meaning, Examples, and Reliable Event Callbacks

A webhook is an HTTP callback that pushes event data to your application. Learn webhook meaning, examples, payloads, URLs, retries, security, and testing patterns for reliable integrations.

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technical

What is a PTR record? Reverse DNS and email deliverability

Learn what PTR records are, how reverse DNS lookup works, and why sender IP identity matters for SMTP deliverability and inbox placement.

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technical

What Is a Mail Transfer Service (MTA Service)?

Understand how mail transfer services route messages, manage retries, and influence deliverability in production email systems.

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technical

Validate frontmatter Markdown SEO metadata in NodeJS

How to parse and validate markdown with YAML headers and assert for required meta data lengths and properties.

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