email setup

[shiidii]

Ok I think I may have muddled things up
I have ispconfig installed, but something gave me the notion that the Mail service wouldn't work, so I also went through with this flurdy tutorial and set up my mail server as such:
http://flurdy.com/docs/postfix/index.html

So, courier is pointed to these mysql databases in order to search for these usernames. Everything is synchronized with that tutorial.
But I am able to log in with my ISPconfig email addresses in outlook express,
and emails aren't coming IN. When sending emails TO the ispconfig emails, I get the response "user unknown"

Here's my Main.cf in postfix

myhostname = mail.mydomain.com
alias_maps = hash:/etc/postfix/aliases
alias_database = hash:/etc/postfix/aliases
myorigin = /etc/mailname
mydestination =
relayhost =
mynetworks = 127.0.0.0/8
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
mailbox_command = procmail -a "$EXTENSION"
inet_protocols = all
smtpd_sasl_local_domain = no
smtpd_sasl_auth_enable = no
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtpd_tls_auth_only = no
smtp_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom

# modify the existing smtpd_recipient_restrictions
smtpd_recipient_restrictions = reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_recipient, reject_unauth_destination, check_policy_service inet:127.0.0.1:60000, permit

I'm sure my changes have messed up the incoming mail resolving. Is there a guide that I can follow to setup postfix/courier to read ispconfig's user emails and not look the ones I setup?