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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.