Microsoft Exchange & LINUX

Ok, I re-ask my question in defferent way .. :-) ...
Since Yersurday, i've succeed in reading the exchange server with Netscape mailer.
But I can't reply to the sender or send new message. It wasn't except any outgoing
message.
But i can read the mail....
(I don't know a lot of SMTP, but may i have a software to translate netscape mail to
exchange ???).
Netscape don't want to connect to the server (the name for outgoing message is the same
as the name for incoming message (cut&paste)).
The time between my sending and the error message is longer than the time between sending and the error message when the name of the server is wrong (i don't know if you understand me very well ???)
Ex: server name BEBRUMP01CFLSGE
The error message come out after 30-45 seconds (It's the real name of the server !!)
When i put a name TOTO
The error message come out after 5 sec.

There's somethig wrong in the connection only for outgoinf mail ...

Thank you for the previous answer (& for the next :-) )

 Hmm... I'm not sure I understand... if you set the SMTP server to the name or IP address of the exchange server you should be able to send mail out.  
 
  You may need to speak with the exchange server administrator if this does not work.

      --Talwyn

Thank you very much for your time.
(I'vegot the IP Adresse of the server. I put it on my outgoing mail and incoming mail. But
i'm still only able reading but not sending).
I'll search more deeper (I cannot ask to the server administrator, he's in England (I'm
in Bruxelles) and he doesn't agree to read with another soft than outlook !!! ). I must
get it from my own (and with help from guy like you).
Thank you very much for your response ....