SMTP With Postfix Behind Nginx R-PROXY

Hello All,

i try to configure my infrastructure, with my servers in Trusted Network, and Nginx Proxy in DMZ.
Until now for http, https and some stream working perfectly.

Also i configure and working imap stream, then i can reach, autenticate and sync my mails.

Problem arrive when i try to configure SMTP with postfix.
I try with mail {} or with stream {}.

Connection arrive to my server, and mail also arrive, but my server put all email in junk, that because in log i can see Nginx proxy change source IP with his.

Some one had same problem? It's possible to configure stream {} or mail {} with real source ip?

Thank you

Alex