NEED HELP URGENTLY

[alfatec]

Hi, We are running OSX Server 10.3.9 using postfix and Squirrel mail. Now we
have been running this for approx 2 1/2 years without any problems. Recently our Local Authority upgraded their firewall and filter system and during this they had quite a few problems which left the network wide open. Since this has happened it now seems as if our OSX Server is being used as a SMTP relay. When I go to console and bring up the SMTP log i just get constant messages being inputted i.e. from weird email address but then most of the messages get put into the deferred folder because of smtpd restrictions. If I go to a SMTP relay test site and put my email server IP or FQDN name in it says that RELAY ACCESS DENIED at the end of the test but something is using the SMTP. I have posted my Postfix Main.cf to assist anybody who can help me.

alias_database = hash:/etc/postfix/aliases
alias_maps = hash:/etc/postfix/aliases
mydomain_fallback = localhost
myhostname = mail.salegrammar.co.uk
mydomain = salegrammar.co.uk
myorigin = $mydomain
mailbox_transport = cyrus
enable_server_options = yes
luser_relay = [email protected]
maps_rbl_domains =
sbl-xbl.spamhaus.org,cbl.abuseat.org,bl.spamcop.net,rbl.maps.vix.com
message_size_limit = 10240000
mydestination = $myhostname,localhost.$mydomain,localhost,$mydomain,$mydomain
smtpd_use_tls = no
smtpd_enforce_tls = no
smtpd_client_restrictions = hash:/etc/postfix/smtpdreject,__________
smtpd_sasl_local_domain = $mydomain
smtpd_sasl_security_options = noanonymous
smtpd_tls_loglevel = 0
smtpd_sasl_auth_enable = yes
smtpd_use_pw_server = yes
smtpd_recipient_restrictions =
permit_sasl_authenticated,
permit_mynetworks,
reject_unauth_destination,
reject_non_fqdn_recipient,
reject_unknown_recipient_domain,
reject_unauth_pipelining,
reject_rbl_client list.dsbl.org,
reject_rbl_client sbl-xbl.spamhaus.org,
reject_rbl_client cbl.abuseat.org,
reject_rbl_client bl.spamcop.net,
reject_rbl_client rbl.maps.vix.com,
permit
smtpd_pw_server_security_options = gssapi,cram-md5,login,plain
smtpd_recipient_limit = 10000
server_enabled = 1
relayhost =
always_bcc =
mynetworks = 127.0.0.1/32,10.15.6.1/32,10.15.0.0/16,10.10.0.0/16,82.0.0.0/8,195.0.0.0/8,
81.0.0.0/8
local_recipient_maps =
unknown_local_recipient_reject_code = 450
smtpd_delay_reject = yes
smtpd_require_helo = yes
smtpd_helo_restrictions = permit_mynetworks,reject_non_fqdn_hostname,reject_invalid_hostname,permit
smtpd_sender_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_non_fqdn_sender,
reject_unknown_sender_domain,reject_unknown_address,permit
smtpd_helo_restrictions = reject_invalid_hostname

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