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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 |
| [email protected] |
| AuthPass=mypassword |
+---------------------------------------------------------+

+---------------------------------------------------------+
| $ sudo nano /etc/ssmtp/revaliases |
+---------------------------------------------------------+
| |
| mylinuxuser:[email protected] |
+---------------------------------------------------------+

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 "[email protected]" -F "This is me" \ |
| [email protected] |
+---------------------------------------------------------+

This sends a mail with the subject "testmail" and no more text to
[email protected].

-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:<[email protected]>
[<-] 250 2.1.0 Ok
[->] RCPT TO:<[email protected]>
[<-] 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" <[email protected]>
[->] 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 ...

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