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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.