邮件服务器-DBMAIL
2013-05-28 16:41:24 
阿炯
DBMAIL 用来替换 Unix 中默认的邮件系统，所有邮件和用户数据都保存在数据库中，而不是文件系统；可创建无限制的邮件帐号，支持 POP3 和 IMAP 协议，用户可维护自己的邮件地址簿。具备更高的可伸缩性、更安全以及更快；支持 MySQL 和 PostgreSQL以及SQLite，支持数据库认证和LDAP认证。
DBMail is an open-source project that enables storage of mail messages in a relational database.Currently MySQL, PostgreSQL, and SQLite can be used as storage backends.
DBMail is made up of several components. A normal MTA (Postfix, SendMail, QMail, Exim) is used for accepting messages. The MTA hands the messages over to dbmail-deliver, using a pipe interface, or to dbmail-lmtpd, using LMTP (Local Mail Transport Protocol).
These programs take care of injecting the message into the database. Messages can be retreived from the database using dbmail-pop3d, using the POP3 protocol, or dbmail-imapd, using the IMAP4Rev1 protocol.
Emails are stored in the database. This includes attachments. User information is also stored in the database, so users do not need a system account on machines DBMail is running on.
DBMail is primarily developed and tested on the GNU Linux and FreeBSD platforms. Users have also reported successfull deployments on OpenSolaris, NetBSD and OSX.
DBMail is released under the GNU Public Licence (version 2).
Feature
Scalability
Dbmail is as scalable as the database system used for storage.
Manageability
Dbmail can be managed by updating the relational database or directory service - without shell access.
Speed
Dbmail uses very efficient, database specific queries for retrieving mail information.
Security
Dbmail doesn't require filesystem access. It's as secure as the database and directory server used.
Flexibility
Changes in a Dbmail system (adding of users, changing passwords etc.) are effective immediately. Users can be stored in the database, or managed separately in an LDAP server such as OpenLDAP or Active Directory.
最新版本：3.0
官方主页：http://www.dbmail.org/