Sendmail is an open-source mail transfer agent (MTA) and mail delivery agent (MDA). It is a computer software package that is responsible for delivering emails from one server to another. It was originally developed by Eric Allman for Unix-based systems and is now used on a variety of platforms. Sendmail is a powerful tool for routing email, and can be used to manage large email systems, or even small ones. It is capable of routing mail between different domains, providing the ability to block or filter mail based on various criteria, and providing the ability to customize and monitor the mail flow. Sendmail is also capable of providing authentication and encryption, allowing it to be used as a secure mail server. Sendmail is a popular choice for many organizations due to its flexibility and scalability, and its ability to integrate with other applications and services.
Discontinued No longer supported.