European alternatives to sendmail

Sendmail is a general-purpose email routing facility that provides a message transfer agent.

European Alternatives

Postfix is a free and open-source mail transfer agent (MTA) that routes and delivers electronic mail.

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix-like systems connected to the Internet.

Mailjet is an email marketing platform designed for creating, sending, and tracking marketing emails.

OpenSMTPD is a free, secure, and open-source implementation of the server-side SMTP protocol as defined by RFC 5321.

Know of another great European alternative we haven't listed? Let us know!