Send email with bash in in TLS, SSL or in plain text

bash-smtp.sh

#!/bin/bash

subject="Subject of my email"
txtmessage="This is the message I want to send"
username='mail@exemple.com'
password='************'
From="mail01@exemple.com"
rcpt='testemail5739230@yopmail.com'
from_name='N BOINA'
rcpt_name='Nicolas Hulot'

{
sleep 0.3;
echo "EHLO $(echo $username | cut -d "@" -f 2 )"
sleep 0.3;

# Comment this line if you use smtp without authentication
echo "AUTH PLAIN $(echo -ne "\0$username\0$password" | base64)"
sleep 0.3;

## uncomment if using smtp without encryption with telnet
#echo "AUTH LOGIN"
#sleep 0.3;
#echo $(echo -ne $username | base64) && echo $username64 
#sleep 0.3;
#echo $(echo -ne "\0$username\0$password" | base64)

sleep 0.3;
echo "MAIL FROM:<$From>"

sleep 0.3;
echo "rcpt to:<$rcpt>"

sleep 0.3;
echo "DATA"

sleep 0.3
echo "Subject: $subject"

sleep 0.3
echo "MIME-Version: 1.0"

sleep 0.3
echo "From: $from_name <$From>"

sleep 0.3
echo "Content-Type: text/html; charset=”UTF-8″"

sleep 0.3
echo "To: $rcpt_name <$rcpt>"

sleep 0.3
echo "Content-Transfer-Encoding: quoted-printable"

sleep 0.3
echo $txtmessage

sleep 0.3;
echo "."

sleep 0.3;

## uncomment one of the following line depending on the encryption mode you want to use.

#} | telnet smtp-relay.gmail.com 25
#} | openssl s_client -starttls smtp -crlf -connect smtp-relay.gmail.com:587
} | openssl s_client -crlf -connect smtp-relay.gmail.com:465