so the other solution would be, that ssmtp will run as the ssmtp-user instead of the real-user.
like /etc/ssmtp/ssmtp.conf can only be read from root/ssmtp-group as you initially suggested.
so the other solution would be, that ssmtp will run as the ssmtp-user instead of the real-user.
like /etc/ssmtp/ ssmtp.conf can only be read from root/ssmtp-group as you initially suggested.