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Add Mail User Accounts
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

mail:~ #
zypper -n install mailx
# set environment variables to use Maildir

mail:~ #
echo 'export MAIL=$HOME/Maildir' >> /etc/profile.d/
# add a user [suse]

mail:~ #
useradd suse

mail:~ #
passwd suse

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

mail suse@localhost

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

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


Heirloom mailx version 12.5 7/5/10.  Type ? for help.
"/home/suse/Maildir": 1 message 1 new
>N  1     Thu Jan 24 19:44   17/516   Test Mail#1

# input the number you'd like to see an email
& 1
Message  1:
From Thu Jan 24 19:44:35 2019
X-Original-To: suse@localhost
Delivered-To: suse@localhost
Date: Thu, 24 Jan 2019 19:44:35 +0900
To: suse@localhost
Subject: Test Mail#1
User-Agent: Heirloom mailx 12.5 7/5/10
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
From: suse <>

This is the first mail.

# to quit, input [q]
& q
Saved 1 message in mbox
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