Dovecot versus Postfix

[Jan Sneep]

Does anyone know of a document that describes the default Ubuntu Postfix and
Dovecot setup?

I'm assuming, (yes I know what a silly thing to do) that who ever setup the
defaults for Postfix and Dovecot in the Ubuntu LAMP server installation disk
knew what they were doing. All the "How To's" I've managed to find so far
assume that one is setting up the servers from scratch. The testing sections
I've read and run the tests show that both servers are up and running. I'm
somewhat loth to just go about randomly changing config settings in an
attempt to figure out how things work, when far greater minds than I setup
the servers in specific ways for, again assuming, very specifc "best
practice" reasons.

Is there a document that describes how things were setup?

and; (perhaps most importantly)

Is there any document on how to use the servers?

 i.e. how to configure an email client to point to the servers. I've tried
to setup the Evolution client that is on the server. It has a nice graphical
"setup" that starts automatically and I put in "jan at Ubuntu" for my email
address, click forward, then on the Sever Type screen I select "Local
Deliver" in the "Path" field you can see it starts out as just a plain "jan"
and then after a second or two it changes to a "jan" with a Home folder icon
in front of it. So here I go assuming again, that the program searched
something / someplace and found my Home folder which it liked for the path
to my mailbox? Problem is the "Forward" button stays grey so I can't
complete the setup.

I don't really want to setup Evolution as I don't plan on checking my email
from the server, but thought if I could get that working as a first step,
then I could move on to figuring out how to get mail from the LAN to work.

I've installed Webmin and both Dovecot and PostFix screens present without
any error messages, which I'm also taking as a sign that the servers are
working, so I can see more options than I'm sure I should be playing with.
:O)

Jan