I'm trying to pass a property into the Message parameter of the SMTP mail writer component. I have a Message property on the incoming record, and I tried setting a global (@Message) and specifying that in the parameter, but I always get a " The expression was trying to access the value of a data record property 'message' but it is undefined or could not be calculated" error. I'm probably making an obvious error, but I can't see it.

Also, can I pass an array into the Message parameter?