mjhjmtu

I'm trying to access a SMTP remote server thru a remote shell using telnet and a command file
containing command to send to that SMTP server as seen on
https://tecadmin.net/ways-to-send-email-from-linux-command-line/#
(note: that on the above website this is done interactivly) but here I want to do that inside a
command file (Iv just copied the yellow/red (the uses input)) to the command file marked
<<<<<<<<< >>>>>>>>>

<<<<<<<<<
HELO yahoo.com
mail from: sender@tecadmin.net
rcpt to: myemail@mail.com
data

Hey
This is test email only

Thanks
.

quit

>

telnet IP smtp < command.txt

this always returns

Trying 1.1.65.49...
Connected to 1.1.65.49.
Escape character is '^]'.
Connection closed by foreign host.

immediatly

whereas when I do it interactily

<<<<<<<<<<<
perlhook@bbis:~/temp_25$ telnet 1.1.65.49 smtp
Trying 1.1.65.49...
Connected to 1.1.65.49.
Escape character is '^]'.
220 miraino-manabi.jp ESMTP Postfix
HELO yahoo.com
250 miraino-manabi.jp
mail from: sender@tecadmin.net
250 2.1.0 Ok
rcpt to: myemail@ymail.com
554 5.7.1 : Relay access denied
^]
telnet> quit

>

I get a return codes 220 250 554

I'v also tried inside a here doc shell script
<<<<<<<<<<
telnet 1.1.65.49 smtp <

Hey
This is test email only

Thanks
.

quit
END_SCRIPT

>

and get the same results.

How can I get around this and make the script act as is it was interactive ?

Thank's in advance