Sendmail
self-hosted, mail agents

Sendmail is a widely-used message transfer agent (MTA) that facilitates the sending, routing, and delivery of email messages across networks. It was one of the earliest mail transfer agents developed for Unix-based systems and remains a fundamental component of many email server setups. Sendmail offers extensive configuration options and supports various email protocols, making it versatile for different email server configurations. Despite its age, Sendmail continues to play a significant role in the email infrastructure of numerous organizations worldwide.

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