The problem I am having is that Email works fine leaving iRedmail.  I have created a Virtual domain test.org  I have created a user rhawkins@test.org  I can email through our exchange server as a relay.  When I try to reply back I keep getting

'rhawkins@test.org' on 2/17/2010 10:18 AM
            The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.
            <lvmail.lvchospital.org #5.1.1 smtp;550 5.1.1 <rhawkins@test.org>: Recipient address rejected: User unknown in virtual mailbox table>

Here is the main.cf:
# See /usr/share/postfix/main.cf.dist for a commented, more complete version

# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# TLS parameters
smtpd_tls_cert_file = /etc/ssl/certs/iRedMail_CA.pem
smtpd_tls_key_file = /etc/ssl/private/iRedMail.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

myhostname = pmail.lvchospital.org
alias_maps = hash:/etc/postfix/aliases
alias_database = hash:/etc/postfix/aliases
myorigin = pmail.lvchospital.org
mydestination = $myhostname, localhost, localhost.localdomain, localhost.$myhostname
relayhost = 172.16.96.19
mynetworks = 127.0.0.0/8, 172.16.96.0/21
mailbox_size_limit = 15728640
recipient_delimiter = +
inet_interfaces = all
mydomain = lvchospital.org
mail_name = iRedMail
mail_version = 0.6.0-beta3
relay_domains = $mydestination, proxy:mysql:/etc/postfix/mysql_relay_domains.cf
inet_protocols = ipv4
mynetworks_style = subnet
smtpd_data_restrictions = reject_unauth_pipelining
smtpd_reject_unlisted_recipient = yes
smtpd_sender_restrictions = permit_mynetworks, reject_unauthenticated_sender_login_mismatch, permit_sasl_authenticated
delay_warning_time = 0h
policy_time_limit = 3600
maximal_queue_lifetime = 1d
bounce_queue_lifetime = 1d
proxy_read_maps = $canonical_maps $lmtp_generic_maps $local_recipient_maps $mydestination $mynetworks $recipient_bcc_maps                                     $recipient_canonical_maps $relay_domains $relay_recipient_maps $relocated_maps $sender_bcc_maps $sender_canonical_maps $                                    smtp_generic_maps $smtpd_sender_login_maps $transport_maps $virtual_alias_domains $virtual_alias_maps $virtual_mailbox_do                                    mains $virtual_mailbox_maps
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks,permit_sasl_authenticated, check_helo_access pcre:/etc/postfix/helo_access.pc                                    re
queue_run_delay = 300s
minimal_backoff_time = 300s
maximal_backoff_time = 4000s
enable_original_recipient = no
disable_vrfy_command = yes
home_mailbox = Maildir/
allow_min_user = no
message_size_limit = 15728640
virtual_mailbox_limit_override = yes
virtual_overquota_bounce = yes
virtual_mailbox_limit_message = Sorry, the user's maildir has overdrawn the disk quota, please notice the user and try ag                                    ain later.
virtual_minimum_uid = 1001
virtual_uid_maps = static:1001
virtual_gid_maps = static:1001
virtual_mailbox_base = /var/vmail/vmail01
check_sender_access = hash:/etc/postfix/sender_access
header_checks = pcre:/etc/postfix/header_checks.pcre
transport_maps = proxy:mysql:/etc/postfix/mysql_transport_maps_user.cf, proxy:mysql:/etc/postfix/mysql_transport_maps_dom                                    ain.cf
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql_virtual_mailbox_domains.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_mailbox_limit_maps = proxy:mysql:/etc/postfix/mysql_virtual_mailbox_limit_maps.cf
virtual_alias_maps = proxy:mysql:/etc/postfix/mysql_virtual_alias_maps.cf, proxy:mysql:/etc/postfix/mysql_domain_alias_ma                                    ps.cf
sender_bcc_maps = proxy:mysql:/etc/postfix/mysql_sender_bcc_maps_domain.cf, proxy:mysql:/etc/postfix/mysql_sender_bcc_map                                    s_user.cf
recipient_bcc_maps = proxy:mysql:/etc/postfix/mysql_recipient_bcc_maps_domain.cf, proxy:mysql:/etc/postfix/mysql_recipien                                    t_bcc_maps_user.cf
relay_recipient_maps = proxy:mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
smtpd_sender_login_maps = proxy:mysql:/etc/postfix/mysql_sender_login_maps.cf
smtpd_reject_unlisted_sender = yes
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain =
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_sasl_authenticated_header = no
smtpd_recipient_restrictions = reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_non_fqdn_sender, rej                                    ect_non_fqdn_recipient, reject_unlisted_recipient, permit_mynetworks, reject_unauth_destination, permit_sasl_authenticate                                    d, reject_non_fqdn_helo_hostname, reject_invalid_helo_hostname, check_policy_service inet:127.0.0.1:10031
smtpd_tls_security_level = may
smtpd_enforce_tls = no
smtpd_tls_loglevel = 0
tls_random_source = dev:/dev/urandom
tls_daemon_random_source = dev:/dev/urandom
#
# Uncomment the following line to enable policyd sender throttle.
#
#smtpd_end_of_data_restrictions = check_policy_service inet:127.0.0.1:10032
mailbox_command = /usr/lib/dovecot/deliver
virtual_transport = dovecot
dovecot_destination_recipient_limit = 1
smtpd_sasl_type = dovecot
smtpd_sasl_path = dovecot-auth
content_filter = smtp-amavis:[127.0.0.1]:10024

I have added lvmail and mx record in DNS and pmail as second mx record.

Thanks in advance!