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Send mail is one of the old and widely used mail delivery agent/Mail system. First Please check this link to know more about Mail Server     Configuration Of Sendmail : 1. All the sendmail configuration files are located at /etc/mail 2. Main configuration files are access, sendmail.mc and send mail.cf. 3. In this example my domain is example.com and my mail server host-name is mx.example.com   Step1 : Install sendmail packages #yum install sendmail* #yum install m4   Step2 : Configure DNS entries in forward look-up zone file #vi /path/to/your/forward/lookup/zone/file mx1.example.com. IN MX 10 example.com. Save the file and exit.   Step3 : Check for configuration errors and reload the DNS server #named-checkzone example.com /path/to/your/forward/lookup/zone/file #service named reload   Step4 : All the sendmail configuration files are stored in /etc/mail and now configure relay ip address list   Why we require this relay list? Ans : This is because to secure your sendmail not get spam. So what ever Network/host-names you specified in this access file those networks/host-names only get access to our sendmail. #vi /etc/mail/access   Entries as follows. 192.168.0.0/24 RELAY Save and exit the file   Step5 : Now update the file to sendmail database with makemap command   Note : After executing below command you will find access.db, this is the indication that your makemap command worked perfect and database have been updated successfully.  ...