In this section, we present three mail servers and the OpenLDAP data store that can support the mail server in an environment with many users.
Postfix is an email server that was designed with performance security and Sendmail compatibility in mind. Like Qmail, Postfix is a collection of modules that create a pipeline to handle various aspects of transferring and delivering email. Unlike Qmail, it stores its configuration file in one monolithic file.
It is flexible with configuration options and it handles large volumes of email effectively.
It works well with popular content scanners.
It provides easy-to-use spam relay control features.
Qmail is a secure email server designed to be a drop-in replacement for Sendmail. It is designed as a collection of modules that create a pipeline to handle various stages of transferring and delivering email. Each program has its own configuration. Qmail works on the Unix system philosophy of “do one thing, and do it well.” It also addresses security concerns by not running as root and by carefully managing trust relationships and intermodule communications.
It provides easy-to-use spam relay control features.
It is designed with security and performance in mind.
Exim is a general-purpose email server that is very flexible and powerful. It is also designed to be a drop-in Sendmail replacement. It is a monolithic program, very much like Sendmail, but unlike Sendmail, it is very easy to configure.
OpenLDAP is the de facto solution for open source directories. It is a popular, mature, stable, and widely used product, and is well supported by an active user and developer base. OpenLDAP has broad support for the latest version of LDAP (LDAPv3) and interoperates well with other LDAP servers (Microsoft Active Directory, Novell eDirectory, Netscape Directory Server, IBM Tivoli Directory Server, etc.). OpenLDAP is the common choice for implementing a directory when replacing a Microsoft Exchange server.
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