https://sudonull.com/email-technical-basics-of-smtp-imap-for-developers
Learn how SMTP and IMAP protocols work, Inbox Zero methods and correspondence optimization for IT specialists. Read a detailed analysis.
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https://sudonull.com/postfix-dkim-docker-send-only-server-setup
Step-by-step guide to deploying Postfix with DKIM in Docker on Ubuntu. Authorization, TLS, SPF. Deliverability testing. For middle/senior devs. Start deploying your own mailer without relay services.
From the web
Jan 14, 2026 ·
https://www.geeksforgeeks.org/computer-networks/simple-mail-transfer-protocol-smtp/
Jan 14, 2026 · SMTP is an application-layer protocol used to send and transfer email between servers. It relies on a TCP connection to port 25 to reliably deliver messages from a client to an email server. Uses TCP for reliable message transmission Servers listen on port 25 for incoming email Client establishes a TCP connection before sending mail Core protocol for email delivery between mail servers SMTP ...
Jan 15, 2025 ·
https://mailtrap.io/blog/smtp/
Jan 15, 2025 · SMTP is a fundamental protocol used in email communication. Most likely, it’s behind the emails we send and receive each day. Though it’s a simple protocol, it still involves multiple components and a lot of details. In this blog post, we’ll take a closer look at SMTP and explore its core features and functionalities.
May 18, 2026 ·
https://www.twilio.com/en-us/blog/insights/what-is-an-smtp-server
May 18, 2026 · SMTP (Simple Mail Transfer Protocol): Servers and sending emails SMTP (Simple Mail Transfer Protocol) is an internet standard communication protocol that enables the transmission of email messages between mail servers. SMTP uses a client-server model to send, receive, and relay emails across networks.
Dec 17, 2025 ·
https://www.smtp.com/blog/technical/what-is-an-smtp-server/
Dec 17, 2025 · What is an SMTP server and how does it work? An SMTP server is a specialized application that manages email transmission using the Simple Mail Transfer Protocol ( SMTP ). It receives outgoing emails from email clients, processes them, and forwards them to the appropriate destination servers until they reach the recipient’s inbox.
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