How To Install exim on CentOS 8
Introduction
In this tutorial we learn how to install exim on CentOS 8.
What is exim
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet. It is freely available under the terms of the GNU General Public Licence. In style it is similar to Smail 3, but its facilities are more general. There is a great deal of flexibility in the way mail can be routed, and there are extensive facilities for checking incoming mail. Exim can be installed in place of sendmail, although the configuration of exim is quite different to that of sendmail.
We can use yum or dnf to install exim on CentOS 8. In this tutorial we discuss both methods but you only need to choose one of method to install exim.
Install exim on CentOS 8 Using dnf
Update yum database with dnf using the following command.
sudo dnf makecache --refresh
The output should look something like this:
CentOS Linux 8 - AppStream 43 kB/s | 4.3 kB 00:00
CentOS Linux 8 - BaseOS 65 kB/s | 3.9 kB 00:00
CentOS Linux 8 - ContinuousRelease 43 kB/s | 3.0 kB 00:00
CentOS Linux 8 - Extras 23 kB/s | 1.5 kB 00:00
CentOS Linux 8 - FastTrack 40 kB/s | 3.0 kB 00:00
CentOS Linux 8 - HighAvailability 36 kB/s | 3.9 kB 00:00
CentOS Linux 8 - Plus 24 kB/s | 1.5 kB 00:00
CentOS Linux 8 - PowerTools 50 kB/s | 4.3 kB 00:00
Extra Packages for Enterprise Linux Modular 8 - x86_64 13 kB/s | 9.2 kB 00:00
Extra Packages for Enterprise Linux 8 - x86_64 24 kB/s | 8.5 kB 00:00
Metadata cache created.
After updating yum database, We can install exim using dnf by running the following command:
sudo dnf -y install exim
Install exim on CentOS 8 Using yum
Update yum database with yum using the following command.
sudo yum makecache --refresh
The output should look something like this:
CentOS Linux 8 - AppStream 43 kB/s | 4.3 kB 00:00
CentOS Linux 8 - BaseOS 65 kB/s | 3.9 kB 00:00
CentOS Linux 8 - ContinuousRelease 43 kB/s | 3.0 kB 00:00
CentOS Linux 8 - Extras 23 kB/s | 1.5 kB 00:00
CentOS Linux 8 - FastTrack 40 kB/s | 3.0 kB 00:00
CentOS Linux 8 - HighAvailability 36 kB/s | 3.9 kB 00:00
CentOS Linux 8 - Plus 24 kB/s | 1.5 kB 00:00
CentOS Linux 8 - PowerTools 50 kB/s | 4.3 kB 00:00
Extra Packages for Enterprise Linux Modular 8 - x86_64 13 kB/s | 9.2 kB 00:00
Extra Packages for Enterprise Linux 8 - x86_64 24 kB/s | 8.5 kB 00:00
Metadata cache created.
After updating yum database, We can install exim using yum by running the following command:
sudo yum -y install exim
How To Uninstall exim on CentOS 8
To uninstall only the exim package we can use the following command:
sudo dnf remove exim
exim Package Contents on CentOS 8
/etc/cron.daily/exim-tidydb
/etc/exim
/etc/exim/exim.conf
/etc/exim/trusted-configs
/etc/logrotate.d/exim
/etc/pam.d/exim
/etc/pam.d/smtp
/etc/pki/tls/certs/exim.pem
/etc/pki/tls/private/exim.pem
/etc/sysconfig/exim
/usr/bin/mailq
/usr/bin/mailq.exim
/usr/bin/newaliases
/usr/bin/newaliases.exim
/usr/bin/rmail
/usr/bin/rmail.exim
/usr/bin/rsmtp
/usr/bin/rsmtp.exim
/usr/bin/runq
/usr/bin/runq.exim
/usr/lib/.build-id
/usr/lib/.build-id/03
/usr/lib/.build-id/03/f3f34f6ac8c20113cd6e7910ba96d5987c8393
/usr/lib/.build-id/20
/usr/lib/.build-id/20/b5c9daf146ec6ac3965ce07e15cfa828bb33e7
/usr/lib/.build-id/3a
/usr/lib/.build-id/3a/3705646780214e43025ec6f4c48d9ca2ce3ceb
/usr/lib/.build-id/41
/usr/lib/.build-id/41/1abc049a9a5312a6c49bb0477ee68f82f2172d
/usr/lib/.build-id/75
/usr/lib/.build-id/75/64edf80b49054035e479f4b955caaced5faf5e
/usr/lib/.build-id/f6
/usr/lib/.build-id/f6/e4b6e302abdbcb887106aa993cd5114eabed05
/usr/lib/sendmail
/usr/lib/sendmail.exim
/usr/lib/systemd/system/exim.service
/usr/lib64/exim
/usr/lib64/exim/4.94.2-1.el8
/usr/lib64/exim/4.94.2-1.el8/lookups
/usr/libexec/exim-gen-cert
/usr/sbin/convert4r4
/usr/sbin/exicyclog
/usr/sbin/exigrep
/usr/sbin/exim
/usr/sbin/exim_checkaccess
/usr/sbin/exim_dbmbuild
/usr/sbin/exim_dumpdb
/usr/sbin/exim_fixdb
/usr/sbin/exim_lock
/usr/sbin/exim_tidydb
/usr/sbin/eximstats
/usr/sbin/exinext
/usr/sbin/exipick
/usr/sbin/exiqgrep
/usr/sbin/exiqsumm
/usr/sbin/exiwhat
/usr/sbin/sendmail
/usr/sbin/sendmail.exim
/usr/share/doc/exim
/usr/share/doc/exim/ACKNOWLEDGMENTS
/usr/share/doc/exim/README
/usr/share/doc/exim/README.UPDATING
/usr/share/doc/exim/doc
/usr/share/doc/exim/doc/ChangeLog
/usr/share/doc/exim/doc/DANE-draft-notes
/usr/share/doc/exim/doc/Exim3.upgrade
/usr/share/doc/exim/doc/Exim4.upgrade
/usr/share/doc/exim/doc/GnuTLS-FAQ.txt
/usr/share/doc/exim/doc/NewStuff
/usr/share/doc/exim/doc/OptionLists.txt
/usr/share/doc/exim/doc/README
/usr/share/doc/exim/doc/README.SIEVE
/usr/share/doc/exim/doc/cve-2016-9663.txt
/usr/share/doc/exim/doc/cve-2019-13917.txt
/usr/share/doc/exim/doc/cve-2019-15846
/usr/share/doc/exim/doc/cve-2019-15846/cve.txt
/usr/share/doc/exim/doc/cve-2019-15846/mitre.mbx
/usr/share/doc/exim/doc/cve-2019-15846/posting-0.txt
/usr/share/doc/exim/doc/cve-2019-15846/posting-1.txt
/usr/share/doc/exim/doc/cve-2019-15846/posting-2.txt
/usr/share/doc/exim/doc/cve-2019-15846/qualys.mbx
/usr/share/doc/exim/doc/cve-2020-qualys.txt
/usr/share/doc/exim/doc/dbm.discuss.txt
/usr/share/doc/exim/doc/exim.8
/usr/share/doc/exim/doc/experimental-spec.txt
/usr/share/doc/exim/doc/filter.txt
/usr/share/doc/exim/doc/openssl.txt
/usr/share/doc/exim/doc/spec.txt
/usr/share/doc/exim/unknownuser.sh
/usr/share/licenses/exim
/usr/share/licenses/exim/LICENCE
/usr/share/licenses/exim/NOTICE
/usr/share/man/man1/mailq.1.gz
/usr/share/man/man8/exim.8.gz
/usr/share/man/man8/eximstats.8.gz
/var/log/exim
/var/spool/exim
/var/spool/exim/db
/var/spool/exim/input
/var/spool/exim/msglog
References
Summary
In this tutorial we learn how to install exim on CentOS 8 using yum and dnf.