postfix with NAT ip .I can't receive mails
 

Help needed
Dear linux users , i have just migrated to linux i dont have much knowledge about linux . I need help on postfix-2.0.16-3 configuration.

Notes
1. I have a registered domain name. ( mydomain1.com )

2. I have 2 PCs on my LAN both of them having their IP 's NAT differently

Lets say PC AA and PC BB

PC AA is hosting my domain ( mydomain1.com ) {O/S windows 2000}
PC BB is hosting postfix ( BB.mydomain1.com ) {O/S redhat Linux 9.0}

3. PC AA has no A and MX records configured. only mydomain1.com configured just
for my webpage.

HELP HELP

HOW DO I CONFIGURE POSTFIX TO RECEIVE MAIL FOR mydomain1.com
i.e main.cf , master.cf , bind , MX ,A records etc.....

i have surffed the internet for docs related to this topic but all in vein

I can send mail to internet say user@hotmail.com
but i can't receive when i reply to that mail.

i can also send and receive mail only on LAN



main.cf
/////////////////////////////////////////////////////////////////////////////////////
alias_database = hash:/etc/postfix/aliases
alias_maps = hash:/etc/postfix/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
default_privs = nobody
inet_interfaces = all
local_destination_concurrency_limit = 2
local_recipient_maps = unix:passwd.byname $alias_maps
mail_owner = postfix
mail_spool_directory = /var/spool/mail
mailbox_command = /usr/bin/procmail -a "$EXTENSION"
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, $mydomain
mydomain = ekinata.com
myhostname = moses.ekinata.com
mynetworks = 192.168.0.0/24, 195.128.33.0/24, 127.0.0.0/8
mynetworks_style = subnet
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /etc/postfix/README_FILES
relay_domains = $mydestination
relay_recipient_maps = hash:/etc/postfix/relay_recipients
sample_directory = /etc/postfix/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)
unknown_local_recipient_reject_code = 450
//////////////////////////////////////////////////////////////////////////////////////