[CentOS] Sending Email Via Telnet

[John Reddy]

> Something isn't quite right with your setup.  When you do the "HELO" command, the server should reply with something.  For example:
> 
> ==
> $ telnet smtp.comcast.net 25
> Trying 76.96.40.155...
> Connected to smtp.comcast.net.
> Escape character is '^]'.
> 220 omta12.emeryville.ca.mail.comcast.net comcast ESMTP server ready
> HELO comcast.net
> 250 omta12.emeryville.ca.mail.comcast.net hello [69.24.1.7], pleased to meet you
> ==
> 
> Does the mail server ever return anything back to you?

No. Never. How do I trouble-shoot this?
TIA,
John