I have done this in the past with MimeCast - I don't think the MimeCast TA supported this, so I wrote a script to pull the message content in from the API.
https://www.mimecast.com/tech-connect/documentation/endpoint-reference/archive/get-message-detail/
I have done this in the past with MimeCast - I don't think the MimeCast TA supported this, so I wrote a script to pull the message content in from the API.
https://www.mimecast.com/tech-connect/documentation/endpoint-reference/archive/get-message-detail/