Call for email server help (kind of OT)

[Donn]

Hi,
I find myself with a new domain and a server. I have got all kinds of things 
working but I cannot figure-out email. Can anyone give me the 'big picture' 
so that I can go grep the details?

1. People need to be able to send mail to blah at mydomain.xyz where mydomain.xyz 
is my new domain on my virtual server.
2. I need to be able to fetch and read this mail from kmail at home (not on 
the server).
3. I need to be able to send a reply from kmail at home such that it will seem 
to come from my server -- i.e. sent from mydomain.xyz

On the server, I have installed Postfix and Courier, so far.

I have been googling and reading docs but just can't get this right. They all 
jump into ssl and spam and anti-virus stuff so fast and I can't even squeak a 
line of text through yet!


Thx,
\d