RE: Trigger workflow after email response
Hi Octavio,
The different approaches here will work.
If you are planning to use a Workflow, you will need to do this on the Creation of an email message, and just add logic to verify that the email status is Received, so it does not execute on all emails.
If you are using a Business Process flow, and the Reopening of the email also requires a change of the status, you will need to call a Custom workflow to do that.
You can use Ultimate Workflow Toolkit or Dynamics 365 Workflow Tools, which both have that Custom Workflow Activity that you can call.
If you have the bandwidth, you can always develop an web service/page that will be triggered when you click a link in the email.
Hope this helps.