We're using the RaiseError AMPscript function to skip sending a Guided Send email to specific Subscribers based on a condition. For example:
RaiseError("Campaign Member already exists", true)
This works well and we see that there was an 'error' in the Status column on the Tracking > Sends page, but I can't find out where we can see the actual error message returned by the AMPscript function (for example, "Campaign Member already exists"). Does anyone know where this is available?