sent smtp mail from the command line

smtp.sh

#!/bin/bash

#### Command line parameters ####
HELO=`hostname`
MAILSERVER=${1:?Mailserver}
PORT=${2:?Mailserver Port}
MAILFROM=${3:?From}
MAILTO=${4:?To}
SUBJECT=${5:?Subject}

#### Message body from stdin ####
DATA=`unix2dos`

#### SEND MAIL via RAW TCP #######
echo 
echo "Connecting to $MAILSERVER on Port $PORT";
echo "Please wait ... "
echo
exec 3<>/dev/tcp/$MAILSERVER/$PORT 
 
if [ $? -ne 0 ] ; then
  echo
	echo "ERROR: Cannot connect to the Mail Server";
	echo "Please check the servername and/or the port number"
	exit
fi
 
echo -en "HELO ${HELO}\r\n"  >&3 
echo -en "MAIL FROM:${MAILFROM}\r\n" >&3
echo -en "RCPT TO:${MAILTO}\r\n" >&3
echo -en "DATA\r\n" >&3
echo -en "Subject: ${SUBJECT}\r\n" >&3
echo -en "\r\n" >&3
echo -en "${DATA}\r\n" >&3
echo -en ".\r\n" >&3
echo -en "QUIT\r\n" >&3
cat <&3