Workflow and incoming e-mail

[Angelo_Besenzoni@sap-consulting.it]

HI WF Users.

In a logistic invoice verification process we send an e-mail to sundry
users that are not Sap users.

Because they are not Sap users, for example they can answer e-mail sent by
workflow with an other e-mail (replay-option of Outlook, for instance).

The problem is: how the workflow can intercept an inbound e-mail and
understand that it is an answer into the current process?

Thanks in advance for your suggestions.

Angelo