Postfix, hjælp med login og lukning open relay

Jeg har et problem..
Jeg skal ikke lokke ind for at sende mails og jeg kan sende fra en hvilken som helst domain fx. "asd@sad.asd" og jeg vil gerne have så det kræves at man logger ind for at sende, men hvordan gør jeg det ??

Jeg bruger webmin, og det min main.cf ser sådan ud..

message_size_limit = 629145600
mailbox_size_limit = 629145600
program_directory = /usr/lib/postfix
command_directory = /usr/sbin
daemon_directory = /usr/lib/postfix

myhostname = Her er mit mail domain..

maps_rbl_domains = relays.visi.com,    relays.ordb.org,    inputs.relays.osirusoft.com,    dialups.relays.osirusoft.com,    spews.relays.osirusoft.com
local_recipient_maps = $relocated_maps $alias_maps unix:passwd.byname
canonical_maps = hash:/etc/postfix/canonical

virtual_maps = hash:/etc/postfix/confixx_virtualUsers, hash:/etc/postfix/confixx_localDomains

relocated_maps = hash:/etc/postfix/relocated

transport_maps = hash:/etc/postfix/transport

alias_maps = hash:/etc/aliases
#alias_maps = hash:/etc/postfix/confixx_localDomains

mailbox_command = /usr/bin/procmail

smtpd_recipient_restrictions = permit_sasl_authenticated,permit_auth_destination,check_relay_domains

#mynetworks = 168.100.189.0/28, 127.0.0.0/8
#mynetworks = $config_directory/mynetworks
#mynetworks = hash:/etc/postfix/confixx_localDomains

mail_name =  Her er mit mail domain..

#smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)

debug_peer_level = 2

debugger_command =
        PATH=/usr/bin:/usr/X11R6/bin
        xxgdb $daemon_directory/$process_name $process_id & sleep 5

maximal_queue_lifetime = 1d
default_privs = mail
undisclosed_recipients_header = To: undisclosed-recipients:;
mail_spool_directory = /var/mail
sender_canonical_maps = hash:/etc/postfix/sender_canonical
#masquerade_exceptions = root
#masquerade_classes = envelope_sender, header_sender, header_recipient
readme_directory = /usr/share/doc/packages/postfix/README_FILES
sample_directory = /usr/share/doc/packages/postfix/samples
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
manpage_directory = /usr/share/man
newaliases_path = /usr/sbin/sendmail
mailq_path = /usr/bin/mailq
masquerade_domains =
defer_transports =
disable_dns_lookups = no
#relayhost =
mailbox_transport =
smtpd_helo_required = yes
strict_rfc821_envelopes = no
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_use_tls = yes
smtpd_enforce_tls = no
#smtpd_tls_auth_only = yes
smtpd_tls_loglevel = 1
smtpd_tls_cert_file = /etc/apache/ssl.crt/confixx.crt
smtpd_tls_key_file = /etc/apache/ssl.key/confixx.key
tls_random_source = dev:/dev/urandom
##smtpd_sasl_security_options = noanonymous
smtpd_sender_restrictions = hash:/etc/postfix/access
disable_vrfy_command = yes

Nogen der kan guide mig igennem det i webmin ??
Jeg er ikke helt glad for debian, men den er nu god nok..