#!/bin/bash

DATE="`date +%Y%m%d-%H%M%S`"

FROM_SERVER="localhost"

MAIL_FROM_NAME="user-name-of-email-address"
MAIL_FROM_DOMAIN="domain-of-email-address"
MAIL_FROM="<$MAIL_FROM_NAME@$MAIL_FROM_DOMAIN>"

MAIL_TO="email-address-of-recipient"
MAIL_TO="<$MAIL_TO>"
MAIL_TO_NAME="`echo $MAIL_TO | cut -d '@' -f 1 | sed -e's/<//'`"
MAIL_TO_DOMAIN="`echo $MAIL_TO | cut -d '@' -f 2 | sed -e's/>//'`"

MAIL_SERVER="ip-or-hostname-of-recipient-mail-server"
## if you want to get automaticaly the recipient mail-server uncoment this two lines
#MAIL_SERVER="`dig -t MX $MAIL_TO_DOMAIN | grep -A 1 "ANSWER SECTION:" | tail -n 1`"
#MAIL_SERVER="`echo $MAIL_SERVER | cut -d ' ' -f 6 | sed -e's/\.$//'`"
MAIL_PORT="25"

SLEEPTIME=3

SUBJECT="subject-of-email"
BODY="text-body-of-email"

echo "## zusammenfassung ##";
echo "telnet $MAIL_SERVER";
echo "ehlo $FROM_SERVER";
echo "mail from: $MAIL_FROM";
echo "rcpt to: $MAIL_TO";
echo "data";
echo "from: $MAIL_FROM";
echo "to: $MAIL_TO";
echo "subject: $SUBJECT";
echo " ";
echo "$BODY";
echo ".";
echo "quit";

echo "## now real run ##";
(
        sleep $SLEEPTIME
        echo "ehlo $FROM_SERVER"
        echo "ehlo $FROM_SERVER" 1>&2
        sleep $SLEEPTIME
        echo "mail from: $MAIL_FROM"
        echo "mail from: $MAIL_FROM" 1>&2
        sleep $SLEEPTIME
        echo "rcpt to: $MAIL_TO"
        echo "rcpt to: $MAIL_TO" 1>&2
        sleep $SLEEPTIME
        echo "data"
        echo "data" 1>&2
        sleep $SLEEPTIME
        echo "from: $MAIL_FROM"
        echo "from: $MAIL_FROM" 1>&2
        sleep $SLEEPTIME
        echo "to: $MAIL_TO"
        echo "to: $MAIL_TO" 1>&2
        sleep $SLEEPTIME
        echo "subject: $SUBJECT"
        echo "subject: $SUBJECT" 1>&2
        sleep $SLEEPTIME
        echo ""
        echo " " 1>&2
        sleep $SLEEPTIME
        echo "$BODY"
        echo "$BODY" 1>&2
        sleep $SLEEPTIME
        echo "."
        echo "." 1>&2
        sleep $SLEEPTIME
        echo "quit"
        echo "quit" 1>&2
        ) |  telnet $MAIL_SERVER $MAIL_PORT