https://github.com/jetmore/swaks
apt install swaks
swaks --server <mailServerIp> --to <receiver>@<domain> --from <sender>@<domain> --body <file>.html --header "Subject: <subject>" --add-header "MIME-Version: 1.0" --add-header "Content-Type: text/html" --header "X-Mailer: <mailHeader>"
swaks -a <user>@<domain> -s smtp.gmail.com:587 -tls -a LOGIN --to <receiver>@<domain> --body <file>.html -header "Subject: <subject>"