send mail using telnet from script
If you have no other option but to use telnet with authentication to send mail 🙂
( echo "ehlo" sleep 1 auth login sleep 1 $(echo username |base64) sleep 1 $(echo password |base64) sleep 1 mail from: from-address sleep 1 rcpt to: recepient sleep 1 data sleep 1 subject: test test mail . exit ) |telnet server port