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A former Gmail engineer investigates why sending email costs so much by implementing SMTP in Haskell, explaining how the protocol works and why third-party providers are needed for deliverability and authentication.
mailcheck 是一个用 Go 编写的小型命令行 SMTP/DNS/TLS 诊断工具，可检查邮件服务器的 MX、SPF、DKIM、DMARC、TLSA/DANE 与 TLS 配置，并支持 Nagios/Icinga、JSON 与人类可读的输出格式。
Outis is an open-source tool that fights AI-generated email spam by generating RFC 3464-compliant fake 'user unknown' bounce messages and sending them via your own domain's SMTP server, tricking senders into removing your address from their lists.
Helo is an independent email API launched on Product Hunt by former Postmark engineers, targeting developers and platforms that send email on behalf of their customers with per-tenant isolation, deliverability safeguards, and usage-based pricing starting at $0.00035 per email.
Xem is an open-source email marketing tool that enables creating newsletters, campaigns, and automations with features like reusable templates and analytics. It supports custom SMTP or managed sending via Amazon SES.
Upyo is a cross-runtime, cross-provider email library for JavaScript and TypeScript that uses web standards to enable universal email sending across Node.js, Deno, Bun, and edge runtimes.
This article explores the mechanisms between an AI agent's decision to send an email and the actual SMTP call, focusing on rate-limiting, queuing, and domain checks in production environments to handle burst sending issues.
This article traces the history of email from its decentralized, trust-based origins to its modern security issues, explaining how protocols like SMTP and MIME emerged as workarounds for technical limitations but left email vulnerable to eavesdropping and tampering.
Posthorn is a self-hosted outbound mail gateway that unifies email sending from multiple apps through a single interface, supporting HTTP and SMTP ingestion with multiple provider transports.
Peter N. M. Hansteen describes his transition to OpenSMTPD as OpenBSD 7.9 drops exim, arguing that OpenSMTPD is the mail server for the 21st century.
A retrospective argues that the OSI-based X.400 email standard offered richer features—encryption, scheduling, read receipts, multilingual text—than SMTP but lost out because SMTP was simpler to implement.