#Email Infrastructure

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March 3rd, 2026

MTA and SMTP: How Mail Transfer Agents Use SMTP To Move Email

Learn how MTA and SMTP fit together, where mail submission ends and relay begins, and how to test routing, queues, retries, and delivery behavior safely.

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ResourceSR

March 3rd, 2026

SMTP Relay Services: How To Compare Providers for Application Send, Relay Control, and Release Safety

Compare SMTP relay services by workflow fit, sender controls, authentication, diagnostics, and testing needs so you choose the right provider for application email and relay operations.

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ResourceEP

March 3rd, 2026

Email Protocols Explained: SMTP, IMAP, POP3, and Where APIs Fit

Learn the main email protocols, what SMTP, IMAP, and POP3 each do, and how to choose the right send, receive, and sync model for apps, support, QA, and product email.

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March 3rd, 2026

SMTP Server Configuration Checklist: Host, Port, TLS, Auth, and DNS

Configure SMTP correctly with a practical checklist for host, port, TLS, authentication, sender identity, and testing from staging to production.

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ResourceSM

March 3rd, 2026

SMTP Mail Protocol Guide: How Simple Mail Transfer Protocol Works

Learn how SMTP works as the mail transport protocol for submission and relay, how it differs from IMAP and POP3, and how to test SMTP workflows safely.

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ResourceP2

March 3rd, 2026

Port 25: What It Is, Why It Gets Blocked, and What To Use Instead

Learn what port 25 is for, why cloud providers often restrict it, how it differs from ports 587 and 465, and when SMTP relay on port 25 is still appropriate.

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ResourceSS

March 3rd, 2026

SMTP Service Guide: Run Your Own vs Managed Platform

Compare self-hosted SMTP and managed SMTP services with a practical decision matrix, operational checklist, and rollout plan for product teams.

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ResourceFS

March 3rd, 2026

Fake SMTP Server Setup for Testing (Local + CI Pattern)

Set up a fake SMTP server for testing, validate send flows safely, and move from local-only checks to production-grade CI email validation.

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