I'm in process setup an evaluation PGP email encryption for our Exchange 2007. We able to send email out but can not receive email from external domain. I had been worked with engineer from PGP but they could not tell what is the issue with. I have PGP universal server between the firewall and spam filter firewall. All the port requested from PGP server are open from the firewall. I'm not sure where is the issue, hopefully someone can help me out.
Please let me know if you need more information