setting up sendmail to forward?

I've never done any network configuration.
My prompt reads: [root@localhost MailTxAuth]#
Often at boot I see <you have new mail @ xyz> which I've read by cat <xyz>.

I've got this app. running on Linux, which accesses the internet, but
its mail-client can't do my ISPs latest send-authorisation.

Apparently this instalation's only MTA is sendmail.
Please give some instructions on how to proceed.
sendmail's man gives only options, for somebody who already knows how to start.

Peter E. wrote:-
> If a Mail Transfer Agent, MTA, is running on your Linux
> system you don't move a text file from ETHO to Linux and
> then send the emessage from a Mail User Agent in Linux.
> Your ETHO system sends the emessage directly to the MTA
> which forwards it to the ISP. It's just a matter of
> configuring exim or Postfix properly on the Linux system.
>
I like that idea. Also, if I learned how to network-configure,
I could do some 'local' testing of eg. send-confirmation,
instead of dialing into my ISP to test each step.

> Exim is still the stock MTA in Debian. I proferred
> working with Postfix when it was necessary but it was an
> optional installation.
>
This present installation has got 'sendmail' which is
reputed to be a monster. I'll try to get some advice
from the 'network USEnetGroup' how to configure it
if I fail after reading the man.
---------
Well I didn't even know where to START after reading the man,
but I liked the /etc/mail/helpfile which explained the:
HELO EHLO AUTH. I read it with `less` and `sendmail help`
just hangs.

== TIA.

On Mon, 25 Apr 2011 10:56:00 +0000, no.top.post wrote:

> My prompt reads: [root@localhost MailTxAuth]#

It's not directly related to your question, but the very first thing you
*need* to do is create an account for yourself and use it instead of
logging in as root for normal use. That's the equivalent of doing
everything as Administrator on a Windows machine and is best described as
a recipe for disaster.

--
Joe Zeff -- The Guy With The Sideburns:
http://www.zeff.us http://www.lasfs.info
If you get published, you can't follow every reader in every bookstore
in the world around--shouting that's not what I meant on page four.