==== MSMTP mail client ====
The MSMTP mail client is a small program capable of sending messages. I use it for sending messages from my server.

My working configuration is below. (password have been removed)
=== Config file ''/etc/msmtprc'' ===
<code>
 # default values
 defaults
 auth            on
 tls             on

 # for debian based systems
 tls_trust_file  /etc/ssl/certs/ca-certificates.crt

 # for rhel based systems
 #tls_trust_file  /etc/pki/tls/certs/ca-bundle.crt

 #tls_starttls   off
 logfile         /var/log/msmtp.log
 
 # Syslog logging with facility LOG_MAIL instead of the default LOG_USER.
 syslog LOG_MAIL
 
 aliases         /etc/aliases
 
 # one.com
 account one
 host send.one.com
 port 465
 from no-reply@example.com
 user no-reply@example.com
 password <PLAIN_TEXT_PASSWORD>
 auto_from off
 domain example.com
 tls_starttls off
 
 # Set default account
 account default : one
</code>

=== example mail file ===
Create a text file named "email.txt" and put some content in it.

<code>
 To: me@example.com
 From: no-reply@example.com
 Subject: Email test from CLI
 Hi,
 
 This is a test message from my server.
</code>

=== Command run ===
Send a test email with this command. Please note that when send as normal user the log file is not accessible.
<code>
 john@server:/tmp$ cat email.txt |msmtp -a one me@example.com
 msmtp: cannot log to /var/log/msmtp.log: cannot open: Permission denied
 msmtp: log info was: host=send.one.com tls=on auth=on user=no-reply@example.com from=no-reply@example.com recipients=me@example.com mailsize=154 smtpstatus=250 smtpmsg='250 2.0.0 Ok: queued as 616eb246-fabb-11e8-b718-d0431ea8a290' exitcode=EX_OK
</code>

==== Using Mutt ====
Sending email using msmtp is all well and good but if you want to send a message with an attachment it just won't do it.

That's where Mutt comes into the picture.

Typically installing mutt can be done with either "**yum install mutt**" or "**apt install mutt**".

You don't need to configure anything, but the from field of your message will then be username@server. if you create a config file you can set the from field to anything you like. 
Create the file ///root/.muttrc// if it does not exist.
<code>
set use_from=yes
set realname=”no-reply”
set from=no-reply@example.com
set envelope_from=yes
</code>

note: if the realname contains a space you should set the value in both double quotes and single quotes. e.g 
<code>
set realname="'John Doe'"
</code>

=== Command run ===
A test email can be send with the following command. (test.txt is the file to attach and body.text is the message body)
<code>
john@server:~$ mutt -s "Testing Mutt" -a test.txt -- recipient@example.com < ./body.txt
</code>