Ubuntu 22.04
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Mail Server : Add Mail User Accounts2022/05/17

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

apt -y install mailutils
# set environment variables to use Maildir

echo 'export MAIL=$HOME/Maildir/' >> /etc/profile.d/mail.sh
# add an OS user [ubuntu]

adduser ubuntu

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

mail ubuntu@localhost

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

# to finish messages, push [Ctrl + D] key

# see received emails


"/home/ubuntu/Maildir/": 1 message 1 new
>N   1 ubuntu             Tue May 17 00:28  13/448   Test Mail #1

# input the number you'd like to see an email
? 1
Return-Path: <ubuntu@mail.srv.world>
X-Original-To: ubuntu@localhost
Delivered-To: ubuntu@localhost
Received: by mail.srv.world (Postfix, from userid 1000)
        id 48DD0A118B; Tue, 17 May 2022 00:28:19 +0000 (UTC)
To: <ubuntu@localhost>
Subject: Test Mail #1
User-Agent: mail (GNU Mailutils 3.14)
Date: Tue, 17 May 2022 00:28:19 +0000
Message-Id: <20220517002819.48DD0A118B@mail.srv.world>
From: ubuntu <ubuntu@mail.srv.world>

This is the first mail.

# to quit, input [q]
? q
Saved 1 message in /home/ubuntu/mbox
Held 0 messages in /home/ubuntu/Maildir/
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