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Email API, deliverability, and QA engineering blog - Page 19
Tactical writing for teams building reliable email and SMS workflows in development, CI, and production operations.
Posts
Who Invented Email? The Fascinating Story of Ray Tomlinson
American Ray Tomlinson and Shiva Ayyaduari are both created with conceiving of and creating electronic mail or email.
Read moretechnicalWhat SMTP Port Should You Use? (Quick Answer + Checklist)
Get a fast answer to what SMTP port to use, plus secure port and TLS pairing guidance for production email delivery.
Read moretechnicalWhat 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.
Read moretechnicalWhat 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.
Read moretechnicalWhat 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.
Read moretechnicalWhat 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.
Read moretechnicalWhat 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.
Read moretechnicalWhat 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.
Read moretechnicalWhat 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.
Read moretechnicalWhat 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.
Read moretechnicalWhat 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.
Read moretechnicalWhat 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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