Postfix+Spamassassin+Courier IMAP questions...I have no idea what I'm doing.

[kaisersouse]

I've spent a few days trying to get Postfix to work correctly, and I'm close to giving up. I went from having a regular webhost who did everything via cPanel to renting my own box through ServerPronto. No cPanel because it's too expensive. I'm using Webmin and/or Putty to configure things, and I'm very very confused. My layout:

1 Server with 1 IP
4 Domains (each w/ associated unix login)
Everything in DNS appears to be fine. Each domain has a cname of mail.whatverdomain.com (mail.domain1.com, mail.domain2.net, etc)

I want mail delivered to /home/~user/Mail/ folder
env (using etc/profile) has "MAIL=/home/$USER/Mail" set up
Postfix is set to deliver to "Mail/" in the home directory

My issues arise with mapping(s):

Delivery: canonical or virtual mappings? I bounce between /etc/postfix/virtual and /etc/postfix/canonical to no avail.

Sending: I want each domain to be able to send messages without the From being rewritten to the primary domain. At the same time, I don't want to be a mail relay.

Transport mapping: Should I define domain1 :[mail.domain1.com] for each domain in /etc/postfix/transport?

I just need the basics for a good main.cf file that will achieve my goal of each domain getting mail in its appropriate mailbox when its sent from outside.

I CAN send from the local machine (using webmin) to the outside test address. However I just replied to those messages and they aren't showing up.

I have issues with courier-imap but I just want to tackle the Postfix problem first, then figure out why every time I telnet (domain1.com 143) and login to IMAP..it immediately boots me out the instant I log in successfully.

Any help would be appreciated. A skeletonized example main.cf would be a godsend.

Thanks!

EDIT: about the mailboxes themselves: Will they be automatically created on initial message delivery or do I create them myself first? Do I create them as the user, or as root? What chmod/chgrp do I use on them?

EDIT2: Here is my main.cf

#soft_bounce = no
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
mail_owner = postfix
#default_privs = nobody
myhostname = mail.comfortablydumb.net
mydomain = comfortablydumb.net
myorigin = $mydomain
inet_interfaces = $myhostname, localhost
#inet_interfaces = localhost
mydestination = $myhostname, localhost.$mydomain, localhost, comfortablydumb.net
local_recipient_maps = unix:passwd.byname $alias_maps
unknown_local_recipient_reject_code = 550
#mynetworks_style = class
#mynetworks_style = subnet
#mynetworks_style = host
mynetworks = 65.111.170.0/28, 127.0.0.0/8
#mynetworks = $config_directory/mynetworks
#mynetworks = hash:/etc/postfix/network_table
#relay_domains = $mydestination
#relayhost = $mydomain
#relayhost = [gateway.my.domain]
#relayhost = [mailserver.isp.tld]
#relayhost = uucphost
#relayhost = [an.ip.add.ress]
#relay_recipient_maps = hash:/etc/postfix/relay_recipients
#in_flow_delay = 1s
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
home_mailbox = Mail/
mail_spool_directory = /var/spool/mail
debug_peer_level = 2
debugger_command =
	 PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
	 xxgdb $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix-2.2.10/samples
readme_directory = /usr/share/doc/postfix-2.2.10/README_FILES
# ----------------------------------------------------
# My additions
# ----------------------------------------------------
#mailbox_command = /usr/bin/procmail -Y -a $HOME
smtpd_client_restrictions = permit_mynetworks, reject
smtpd_helo_restrictions = reject_unknown_helo_hostname
smtpd_sender_restrictions = reject_unknown_sender_domain
smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination
smtpd_data_restrictions = reject_unauth_pipelining
smtpd_end_of_data_restrictions = check_policy_service unix:private/policy
virtual_mailbox_domains = hash:/etc/postfix/virtual
virtual_mailbox_base  = /home/$USER
virtual_mailbox_maps = hash:/etc/postfix/virtual
virtual_uid_maps = hash:/usr/local/postfix/etc/virtual_uids
virtual_gid_maps = hash:/usr/local/postfix/etc/virtual_gids 
virtual_alias_maps = hash:/etc/postfix/virtual

EDIT again: updated the main.cf entry above. The machine passes local mail fine, but outside mails bounce with "Client Host Rejected: Access Denied" from the outside mail system i attempt to send from.

[kaisersouse]

nevermind. i've fixed it.