Using telnet command in script for send mail

Question

I wanna send an email via a command in Centos7. I used 'telnet' command for this issue like this:

I touch example.sh file and save these command inside it:

echo "open mail.test.com 25"
sleep 3
echo "mail from:[email protected]"
echo "rcpt to:[email protected]"
echo "data"
echo "hello"
echo "."
sleep 3  

And use this command ./example.sh | telnet
but it doesn't work.

Answer 1

telnetis designed for interactive usage. Use netcat, ncat, nc, socat or any other tool of this family.

Example:

./example.sh | ncat mail.test.com 25 

Herefore you have to edit your script:

echo "mail from:[email protected]"
echo "rcpt to:[email protected]"
echo "data"
echo "hello"
echo "."
sleep 3  

The last sleep 3 is important to give ncat enough time to handle result.

btw, I have tested nothing (just written down)