Receive Emails Securly

Hello,

 I have two exchange servers running both CAS and MB roles. I have also configured a reverse proxy server on my DMZ for secure access to my OWA.I can send emails, but I can't receive emails. The reverse proxy can't work in my DMZ to receive mails. Am I right? Now how can I receive emails in a secure way please? Thanks a lot.

Regards,
Pooriya

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Pooriya Aghaalitari