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Mail Server : Add Mail User Accounts2023/07/07

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

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

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

adduser debian

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

mail debian@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/debian/Maildir/": 1 message 1 new
>N   1 debian             Fri Jul  7 05:35  13/448   Test Mail #1

# input the number you'd like to see an email
? 1
Return-Path: <>
X-Original-To: debian@localhost
Delivered-To: debian@localhost
Received: by (Postfix, from userid 1000)
        id 35D44A03A6; Fri,  7 Jul 2023 00:35:17 -0500 (CDT)
To: <debian@localhost>
Subject: Test Mail #1
User-Agent: mail (GNU Mailutils 3.15)
Date: Fri,  7 Jul 2023 00:35:17 -0500
Message-Id: <>
From: debian <>

This is the first mail.

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