Has anyone ever setup remote (outside of network) email access where workflow buttons trigger the action in the related X3 workflow?  

I’m searching for information regarding cell phone, or remote email access to X3 generated workflow emails that require approval or rejection.  The classic purchase requisition approval workflow email is the subject matter (PSHSIG).  In this instance, would a SSL /TLS certificate be required?  What is the procedure to setup remote email (outside of network) approvals?   The buttons only appear to work when inside the network.  

Hope this makes sense.  Any information would be helpful.

Thanks!

Tom