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====== exim4 install log ======
<code>
root@raspberrypi:~# apt-get install exim4
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  liblockfile-bin liblockfile1 libsigsegv2 libxcb-image0 libxcb-util0 lockfile-progs m4 procmail sendmail-base sendmail-cf sensible-mda
Use 'apt autoremove' to remove them.
The following additional packages will be installed:
  exim4-base exim4-config exim4-daemon-light
Suggested packages:
  exim4-doc-html | exim4-doc-info eximon4 spf-tools-perl swaks
The following packages will be REMOVED:
  sendmail sendmail-bin
The following NEW packages will be installed:
  exim4 exim4-base exim4-config exim4-daemon-light
0 upgraded, 4 newly installed, 2 to remove and 54 not upgraded.
Need to get 1,957 kB of archives.
After this operation, 1,873 kB of additional disk space will be used.
Do you want to continue? [Y/n]
Get:1 http://raspbian.mirror.digitalpacific.com.au/raspbian buster/main armhf exim4-daemon-light armhf 4.92-8+deb10u5 [493 kB]
Get:2 http://raspbian.mirror.digitalpacific.com.au/raspbian buster/main armhf exim4-config all 4.92-8+deb10u5 [324 kB]
Get:3 http://raspbian.mirror.digitalpacific.com.au/raspbian buster/main armhf exim4-base armhf 4.92-8+deb10u5 [1,133 kB]
Get:4 http://raspbian.mirror.digitalpacific.com.au/raspbian buster/main armhf exim4 all 4.92-8+deb10u5 [7,168 B]
Fetched 1,957 kB in 3s (590 kB/s)
Preconfiguring packages ...
(Reading database ... 64551 files and directories currently installed.)
Removing sendmail (8.15.2-14~deb10u1) ...
dpkg: sendmail-bin: dependency problems, but removing anyway as you requested:
 sensible-mda depends on sendmail-bin | mail-transport-agent; however:
  Package sendmail-bin is to be removed.
  Package mail-transport-agent is not installed.
  Package sendmail-bin which provides mail-transport-agent is to be removed.
  Package exim4-daemon-light which provides mail-transport-agent is not installed.
 sensible-mda depends on sendmail-bin | mail-transport-agent; however:
  Package sendmail-bin is to be removed.
  Package mail-transport-agent is not installed.
  Package sendmail-bin which provides mail-transport-agent is to be removed.
  Package exim4-daemon-light which provides mail-transport-agent is not installed.

Removing sendmail-bin (8.15.2-14~deb10u1) ...
Selecting previously unselected package exim4-daemon-light.
(Reading database ... 64496 files and directories currently installed.)
Preparing to unpack .../exim4-daemon-light_4.92-8+deb10u5_armhf.deb ...
Unpacking exim4-daemon-light (4.92-8+deb10u5) ...
Selecting previously unselected package exim4-config.
Preparing to unpack .../exim4-config_4.92-8+deb10u5_all.deb ...
Unpacking exim4-config (4.92-8+deb10u5) ...
Selecting previously unselected package exim4-base.
Preparing to unpack .../exim4-base_4.92-8+deb10u5_armhf.deb ...
Unpacking exim4-base (4.92-8+deb10u5) ...
Selecting previously unselected package exim4.
Preparing to unpack .../exim4_4.92-8+deb10u5_all.deb ...
Unpacking exim4 (4.92-8+deb10u5) ...
Setting up exim4-config (4.92-8+deb10u5) ...
Setting up exim4-base (4.92-8+deb10u5) ...
exim: DB upgrade, deleting hints-db
Setting up exim4-daemon-light (4.92-8+deb10u5) ...
Setting up exim4 (4.92-8+deb10u5) ...
Processing triggers for man-db (2.8.5-2) ...
Processing triggers for systemd (241-7~deb10u6+rpi1) ...
</code>

===== Configure =====
<code>
# dpkg-reconfigure exim4-config
</code>

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