Use telnet to send email with an attachement

smtp-telnet.sh

#!/bin/bash

filename="/path/to/your/file.log"
subject="Subject of my email"
txtmessage="This is the message I want to send"

{
sleep 1;
echo "EHLO mydomain.intra"
sleep 1;
echo "MAIL FROM:me@example.com"
sleep 1;
echo "RCPT TO:him@example.com"
sleep 1;
echo "DATA"
sleep 1;
echo "Subject:" $subject
sleep 1;
echo "Content-Type: multipart/mixed; boundary="KkK170891tpbkKk__FV_KKKkkkjjwq""
sleep 1;
echo ""
sleep 1;
echo "This is a MIME formatted message.  If you see this text it means that your"
sleep 1;
echo "email software does not support MIME formatted messages."
sleep 1;
echo ""
sleep 1;
echo "--KkK170891tpbkKk__FV_KKKkkkjjwq"
sleep 1;
echo "Content-Type: text/plain; charset=UTF-8; format=flowed"
sleep 1;
echo "Content-Disposition: inline"
sleep 1;
echo ""
sleep 1;
echo $txtmessage
sleep 1;
echo ""
sleep 1;
echo ""
sleep 1;
echo "--KkK170891tpbkKk__FV_KKKkkkjjwq"
sleep 1;
echo "Content-Type: file --mime-type -b filename-$(date +%y%m%d).zip; name=filename-$(date +%y%m%d).zip"
sleep 1;
echo "Content-Transfer-Encoding: base64"
sleep 1;
echo "Content-Disposition: attachment; filename="filename-$(date +%y%m%d).zip";"
sleep 1;
echo ""
sleep 1;
# The content is encoded in base64.
cat $filename | base64;
sleep 1;
echo ""
sleep 1;
echo ""
sleep 1;
echo "--KkK170891tpbkKk__FV_KKKkkkjjwq--"
sleep 1;
echo ""
sleep 1;
echo "."
sleep 1;
echo "quit"
} | telnet smtp.server.intra  25

Thank you for your source code ,,
My Linux Server cannot setup sendmail service
Your solution helpful for my job.

Thank you very much

This was very helpful, just have a question though, how do I send with an attachment size greater than 5MB.