Debian9

#  apt install -y ssmtp
#  apt install -y mailutils
#  apt install -y multitail
  #   vi   /etc/ssmtp/ssmtp.conf  
     
     
  #   sendmail Status   
  #   sendmail restart  
  #   multitail /var/log/mail.err /var/log/mail.info /var/log/mail.log /var/log/mail.warn  

Source/Quellen:
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- blog.edmdesigner.com/send-email-from-linux-command-line
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