mail behind nat

Hello all!
I have server behind FQDN GW. Server has not routeble ip (10.10.10.10) and my trouble is that domains who check my host name (or username?) reject my messages.
Code:
SMTP error from remote mail server after RCPT TO: <user@domain.net>: host domain.net: 451 Sender verification faild for my_user@my_domain.net
Any ideas?
 
You need to set the sender's domain (*@my_domain.net) correctly. It looks like it's currently using a fake domain and the recipient thinks you're a spammer.
 
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