Encrypted mails by PGP server doesn't go out via symantec messaging gateway.

Hi All,

We have a setup like below;

Client --> Exchange Server --> Symantec Encryption Management Server (aka PGP server) --> Symantec Messaging Gateway --> Internet.

The unencrypted emails are processed and going through as expected. No issues.

When I excrypt that message and send, It doesn't go through. 

Is there something I need to do in my Messaging Gateway or PGP server? 

Please advise. 

Thanks