Chapter 22. Software -Server/Mail Network

Table of Contents
22.1. Linux Sendmail Server
22.2. Compile and optimize
22.3. Configurations
22.4. The /etc/ file /Central Mail Hub
22.5. Build and Tweak Sendmail
22.6. The /etc/mail/access and access.db files
22.7. The /etc/mail/aliases and aliases.db files
22.8. The /etc/mail/local-host-names file
22.9. The /etc/rc.d/init.d/sendmail script file
22.10. Secure Sendmail using smrsh
22.11. The /etc/mail/aliases file
22.12. Limit queue processing to root
22.13. Sendmail Administrative Tools
22.14. Installed files: Sendmail -Central Mail Hub
22.15. Installed files: Sendmail -Local server/client

The Sendmail program is one of the most widely used Internet Mail Transport Agents -MTAs in the world. The purpose of an MTA is to send mail from one machine to another, and nothing else. Sendmail is not a client program, which you use to read your e-mail. Instead, it actually moves your email over networks, or the Internet, to where you want it to go. Sendmail has been an easy target for system crackers to exploit in the past, but with the advent of Sendmail version 8, this has become much more difficult.