sendmail is a MTA (mail transfer agent) in linux used to send emails.
dovecot is a mail authentication software.
squirrelmail is a mail user agent similar to email client.
lets install the packages
$dnf install sendmail sendmail-cf sendmail-doc cyrus-sasl-{lib,plain} dovecot squirrelmail
2.configure sendmail
$vi /etc/mail/sendmail.mc line 122 set as DAEMON_OPTIONS(`Port=smtp,Name=MTA')dnl line 161 set as LOCAL_DOMAIN(`server.sand.box')dnl build the configuration file with make. cd /etc/mail make all restart the sendmail service #systemctl restrat sendmail
3.Configure squirrelmail
$cd /usr/share/squirrelmail/config/ #./config.pl SquirrelMail Configuration : Read: config.php (1.4.0) --------------------------------------------------------- Main Menu -- 1. Organization Preferences 2. Server Settings 3. Folder Defaults 4. General Options 5. Themes 6. Address Books 7. Message of the Day (MOTD) 8. Plugins 9. Database 10. Languages D. Set pre-defined settings for specific IMAP servers C Turn color off S Save data Q Quit Command >> 1 #set organization preferences to below. SquirrelMail Configuration : Read: config.php (1.4.0) --------------------------------------------------------- Organization Preferences 1. Organization Name : server.sand.box 2. Organization Logo : ../images/sm_logo.png 3. Org. Logo Width/Height : (308/111) 4. Organization Title : SquirrelMail $version 5. Signout Page : 6. Top Frame : _top 7. Provider link : https://squirrelmail.org/ 8. Provider name : SquirrelMail R Return to Main Menu C Turn color off S Save data Q Quit Command >> 2 #server settings set this to. SquirrelMail Configuration : Read: config.php (1.4.0) --------------------------------------------------------- Server Settings General ------- 1. Domain : localhost 2. Invert Time : false 3. Sendmail or SMTP : Sendmail A. Update IMAP Settings : localhost:143 (uw) B. Change Sendmail Config : /usr/sbin/sendmail R Return to Main Menu C Turn color off S Save data Q Quit Command >> you can leave other settings as same. 3.Configure Dovecot. cd /etc/dovecot/ vi 10-mail.conf mail_location = maildir:~/Maildir vi 10-ssl.conf ssl = yes vi 10-auth.conf disable_plaintext_auth = no auth_mechanisms = plain login vi dovecot.conf protocols = imap pop3 lmtp listen = * #restart dovecot #systemctl restart dovecot ; systemctl restart sendmail ; systemctl restart httpd.
Now you can access squirrel mail from https://localhost/webmail
After setting alias emails to other user if you want to see all root emails in new user mailbox then use command
# formail -s /usr/sbin/sendmail -oi -t < /var/mail/root
or
$ formail -s /usr/sbin/sendmail -oi -t < /var/spool/mail/root