problem with configuration smtp relay

i have problems with the smtp proxy configuration, because send me that i am a open smtp relay, this is my configuration:

Hostname (mx): mail.mydomain.com
Postmaster address: administrator@mydomain.com
Max messagesize: unlimited

Incoming mail

mydomain.com             internalmail


Outgoing Mail

Allow networks      Internal_network
                              private-network-ipsec-lan

Use smarthost:  nothing
tls transaction encryption:  nothing


Global Whitelist

Trusted hosts/networks :    any

trusted domains:     nothing

Anti-spam /content control : nothing



Help me please ¡¡¡ 

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