Send email to a logon user on same machine using sSMTP

[Cbhihe]

Hello everybody, my 1st post here.
Configuring sSMTP on an Ubuntu 14.04, I see that the configuration file allows (logically) sending email outside to a specific user@domain.
However does it also allow sending email from one logon-user to another when those two conveniently have accounts on the same server ? If not what do I need to install and configure to be able to do that, without resorting to sending email out of the machine.

I.e. imagine that john wants to send email to sandy; can he just do ?

[john@server] $ ssmtp sandra

Thank you for any pointer.
-ced

[AnaximanderThales]

Maybe -- sSMTP is not a mail server. Look to see if you have /usr/sbin/sendmail (that's /usr/sbin/sendmail -- not the SendMail Suite). You'll be able to do what you're asking if it's on there.

If it's not there, take a look at postfix, qmail, exim4 or sendmail (again, not the suite)