memory

[Adri <a.peluso@fulltrading.it>]

Hello all,

I have some scattered questions

a) I read that sometimes linu doesn't see all the ram you have installed on 
your machine.
How can I verify hao much ram does my debian sees? And how can I correct 
the situation in case there's something wrong?

b) how can I know how much space on my disk is free and how much is not 
free? Which is the utility?

Also I saw I have exim installed and I have a smtp service running. How can 
I send a simple email? I don't want a complete email setup for now, I'd 
just love to send a simgle email, my first mail from linux !!
I should use the smtp relay of the company, should I edit the 
/etc/exim.conf file?

Thnak you all
Bye
Adri