排行榜与检索

Fast, highly extensible, and event driven SMTP server.

Secure SMTP server implementation from the OpenBSD project.

Small MTA for home and office use. Works on Linux and FreeBSD.

SMTP (email) server with a focus on simplicity, security, and ease of operation.

Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.

Small and easy to configure SMTP and POP3 server for Windows and Linux.

Message transfer agent (MTA) developed at the University of Cambridge.

Message transfer agent (MTA).

Fast, easy to administer, and secure Sendmail replacement.