CentOS 8
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Mail Server : Add Mail User Accounts2019/11/07

 
Add Mail User Accounts to use Mail Service.
This example is for the case you use OS user accounts.
Configure basic Postfix settings, and basic Dovecot settings first.
[1] To use OS user accounts, that's only adding OS user like follows.
# install mail client program

[root@mail ~]#
dnf -y install mailx
# set environment variables to use Maildir

[root@mail ~]#
echo 'export MAIL=$HOME/Maildir' >> /etc/profile.d/mail.sh
# add a user [cent]

[root@mail ~]#
useradd cent

[root@mail ~]#
passwd cent

[2] Login as a user added in [1] and try to send an email.
# send to myself [mail (username)@(hostname)]

[cent@mail ~]$
mail cent@localhost

# input subject
Subject: Test Mail#1
# input messages
This is the first mail.

# to finish messages, input period(.) and Enter
.
EOT
# see received emails

[cent@mail ~]$
mail

Heirloom Mail version 12.5 7/5/10.  Type ? for help.
"/home/cent/Maildir": 1 message 1 new
>N  1 cent@srv.world        Tue Nov  5 19:08  17/507   "Test Mail#1"

# input a number you'd like to see an email
& 1
Message  1:
From cent@srv.world Tue Nov  5 19:08:41 2019
Return-Path: <cent@srv.world>
X-Original-To: cent@localhost
Delivered-To: cent@localhost
Date: Tue, 05 Nov 2019 19:08:41 +0900
To: cent@localhost
Subject: Test Mail#1
User-Agent: Heirloom mailx 12.5 7/5/10
Content-Type: text/plain; charset=us-ascii
From: cent@srv.world
Status: R

This is the first mail.

# to quit, input [q]
& q
Held 1 message in /home/cent/Maildir
Matched Content