邮件服务器-Courier-MTA
2013-10-06 07:22:14 
阿炯
Courier 是一个优秀的电子信件系统，功能上它远比 Qmail、Postfix 等我们已经熟知的系统完整，包含了 ESMTP (含身份认证)、POP3、IMAP、传真、网页信箱界面、保密通信 (SSL 和 TLS 涵盖 SMTP、POP3、IMAP)、多种用户数据库 (UNIX® 操作系统的用户数据文件(通过 PAM(3))、Berkeley DB、LDAP、MySQL、PostgreSQL)。而它也吸收了先前信件系统的优点。Courier 中的信件过滤器 maildrop、IMAP 服务器组件还常被与其它电子信件系统(如 Postfix) 配合使用。采用c开发并在GPL协议下授权。The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework. Individual components can be enabled or disabled at will. The Courier mail server now implements basic web-based calendaring and scheduling services integrated in the webmail module. Advanced groupware calendaring services will follow soon.
The Courier mail server's source code should compile on most POSIX-based operating systems based on Linux, and BSD-derived kernels. The Courier mail server should also compile on Solaris and AIX, with some help from Sun's or IBM's freeware add-on tools for their respective operating systems.
The Courier mail server evolved out of several related projects, that merged together (more on that later). The Courier mail server implements SMTP extensions for mailing list management and spam filtering. The Courier mail server can function as an intermediate mail relay, relaying mail between an internal LAN and the Internet, or perform final delivery to mailboxes. The Courier mail server uses maildirs as its native mail storage format, but it can also deliver mail to legacy mailbox files as well. The Courier mail server's configuration is set by plain text files and Perl scripts. Most of The Courier mail server's configuration can now be adjusted from a web browser, using The Courier mail server's web-based administration module.
The Courier mail server can provide mail services for regular operating system accounts. The Courier mail server can also provide mail services for virtual mail accounts, managed by an LDAP, MySQL, or PostgreSQL-based authentication database.
最新版本：0.7
增加了ratefilter，用来限制速率的邮件过滤器。
官方主页：http://www.courier-mta.org/