Automate Gmail SMTP login to send email via sh script.

gmail.sh

#!/bin/sh
smtpsrv="smtp.gmail.com"
smtpport="587"
smtpusr=""
smtppwd=""
username64=$( echo $smtpusr | base64 ) # $( base64_encode $smtpusr )
password64=$( echo $smtppwd | base64 ) # $( base64_encode $smtppwd )

(
    echo "EHLO localhost"; sleep 3;
    echo "AUTH LOGIN"; sleep 3;
    echo "${username64}"; sleep 3;
    echo "${password64}"; sleep 3;
) | openssl s_client -starttls smtp -connect ${smtpsrv}:${smtpport} -crlf -ign_eof