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            Installation and Configuration
            Sending Mails from Commandline



Today I installed 'sSMTP' on my VPS to have the ability to
send mails from commandline. 

+---------------------------------------------------------+
| $ sudo apt install ssmtp                                |
+---------------------------------------------------------+

There are two config files to adapt: 

     /etc/ssmtp/ssmtp.conf
     /etc/ssmtp/revaliases

I configured sSMTP to use it with my 'mailbox.org' mail account.
(See https://mailbox.org/ for a privacy friedly mail account.)

+---------------------------------------------------------+
| $ sudo nano /etc/ssmtp/ssmtp.conf                       |
+---------------------------------------------------------+
|                                                         |
|     hostname=mailbox.org                                |
|     FromLineOverride=YES                                |
|     UseSTARTTLS=YES                                     |
|     UseTLS=YES                                          |
|     mailhub=smtp.mailbox.org:587                        |
|     AuthUser=myuser@mailbox.org                         |
|     AuthPass=mypassword                                 |
+---------------------------------------------------------+

+---------------------------------------------------------+
| $ sudo nano /etc/ssmtp/revaliases                       |
+---------------------------------------------------------+
|                                                         |
|     mylinuxuser:myuser@mailbox.org                      |
+---------------------------------------------------------+


The senders fullname ist the logged-in linux users fullname.
Take a look at  /etc/passwd  ...

+---------------------------------------------------------+
| $ cat /etc/passwd                                       |
|                                                         |
| ...                                                     |
| mylinuxuser:x:1000:1000:My Fullname,,,:/home/...        |
| ...                                                     |
+---------------------------------------------------------+

BTW, you can change the fullname with 'chfn'

+---------------------------------------------------------+
| $ sudo chfn -f "New Fullname" mylinuxuser               |
+---------------------------------------------------------+

You can override the sender email and fullname during runtime by adding 

    FromLineOverride=YES

to your '/etc/ssmtp/ssmtp.conf' file.


When the configuration is done, a testmail can be sent:

+---------------------------------------------------------+
| $ echo "Subject: testmail" | ssmtp -vvv \               |
|        -f "myuser@mailbox.org" -F "This is me"  \       |
|        a.friend@nowhere.net                             |
+---------------------------------------------------------+

This sends a mail with the subject "testmail" and no more text to 
a.friend@nowhere.net.

-vvv turns on verbosity output
-f   overrides the senders email address configured in 
     /etc/ssmtp/revaliases
-F   overrides the senders fullname configured in 
     /etc/passwd 


Sample -vvv verbose output:

[<-] 220 smtp2.mailbox.org ESMTP Postfix
[->] EHLO mailbox.org
[<-] 250 CHUNKING
[->] STARTTLS
[<-] 220 2.0.0 Ready to start TLS
[->] EHLO mailbox.org
[<-] 250 CHUNKING
[->] AUTH LOGIN
[<-] 334 ************
[->] **************************==
[<-] 334 ************
[<-] 235 2.7.0 Authentication successful
[->] MAIL FROM:<myuser@mailbox.org>
[<-] 250 2.1.0 Ok
[->] RCPT TO:<a.friend@nowhere.net>
[<-] 250 2.1.5 Ok
[->] DATA
[<-] 354 End data with <CR><LF>.<CR><LF>
[->] Received: by mailbox.org (sSMTP sendmail emulation); Mon, 28 Jun 2021 23:01:21 +0200
[->] From: "This is me" <myuser@mailbox.org>
[->] Date: Mon, 28 Jun 2021 23:01:21 +0200
[->] Subject: testmail
[->] 
[->] .
[<-] 250 2.0.0 Ok: queued as *********
[->] QUIT
[<-] 221 2.0.0 Bye


You can also send mails with more text, attachments ...


___________________________________________________28_06_2021___