Useful snippet I wrote up after searching the internet for details on syntax for sendmail in Linux.
PRETTY_HOSTNAME=$(hostnamectl --pretty) ADMIN_USERNAME='username' ADMIN_PASSWORD='password' sendmail -F "firstname.lastname@example.org" -it <<END_MESSAGE Content-Type: text/html MIME-Version: 1.0 To: email@example.com Subject: [INFO] Connection Details Hostname: $PRETTY_HOSTNAME <br /> If your program is down, do the following. <br /> 1. Open Putty <br /> 2. Establish Connection to $PRETTY_HOSTNAME <br /> 2a. Username: $ADMIN_USERNAME <br /> 2b. Password: $ADMIN_PASSWORD <br /> 3a. Check for the status of your program. <br /> If there are any questions or concerns please reach out to your server admin. <br /> Thanks, <br /> Automated System END_MESSAGE