hey stevie, looks like I'm getting through from the local machine:

$ nc HOSTNAME 25
hello, email world
hey stevie, it worked!
^C
$
[download]

to the remote target:

Last login: Thu May 19 00:12:40 2022 
wilma@fourth:~$ sudo -i
[sudo] password for wilma: 
root@fourth:~# which nc
/usr/bin/nc
root@fourth:~# sudo nc -l 25
hello, email world
hey stevie, it worked!
root@fourth:~#
[download]

Yeah, I guess so.:) Reminds me of the old days when we really used telnet....