CentOS 7
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Add Mail Accounts#1
2017/06/28
 
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

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

[root@mail ~]#
echo 'export MAIL=$HOME/Maildir' >> /etc/profile
# 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                  Thu Jun 29 16:49  17/530   "Test Mail#1"

# input the number you'd like to see an email
& 1
Message  1:
From cent@srv.world Thu Jun 29 19:49:34 2017
Return-Path: <cent@srv.world>
X-Original-To: cent@localhost
Delivered-To: cent@localhost.srv.world
Date: Thu, 29 Jun 2017 19:49:33 +0900
To: cent@localhost.srv.world
Subject: Test Mail#1
User-Agent: Heirloom mailx 12.5 7/5/10
Content-Type: text/plain; charset=us-ascii
From: cent@srv.world (cent)
Status: R

This is the first mail.

# to quit, input [q]
& q
Held 1 message in /home/cent/Maildir
You have mail in /home/cent/Maildir
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