install heirloom-mailx   $ sudo apt-get install heirloom-mailx     send an email with an external smtp server   with ssl echo “This is the message body and contains the message” | mailx -v -r “[email protected]” -s “This is the subject” -S smtp=”mail.example.com:587″ -S smtp-use-starttls -S smtp-auth=login -S smtp-auth-user=”[email protected]” -S smtp-auth-password=”abc123″ -S ssl-verify=ignore [email protected] without ssl echo “This is the message body and contains the message” | mailx -v -r “[email protected]” -s “This is the […]