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Exim delivers electronic mail, both local and remote. It has all the virtues of a good postman: it`s easy to talk to, reliable, efficient, and eager to accommodate even the most complex special requests. It`s the default mail transport agent installed on some Linux systems, runs on many versions of Unix, and is suitable for any TCP/IP network with any combination of hosts and end-user mail software.Exim is growing in popularity because it is open source, scalable, and rich in features such as the following:

• Compatibility with the calling interfaces and options of Sendmail (for which Exim is usually a drop-in replacement)
• Lookups in LDAP servers, MySQL and PostgreSQL databases, and NIS or NIS+ services
• Support for many kinds of address parsing, including regular expressions that are compatible with Perl 5
• Sophisticated error handling
• Innumerable tuning parameters for improving performance and handling enormous volumes of mail

Best of all, Exim is easy to configure. You never have to deal with ruleset 3 or worry that a misplaced asterisk will cause an inadvertent mail bomb.While a basic configuration is easy to read and can be created quickly, Exim`s syntax and behavior do get more subtle as you enter complicated areas like virtual hosting, filtering, and automatic replies. This book is a comprehensive survey that provides quick information for people in a hurry as well as thorough coverage of more advanced material.