From: aperson@domain.example
To: bperson@domain.example
Content-Type: multipart/digest; boundary=XYZ

--XYZ
Content-Type: text/plain


This is a text plain part that is counter to recommended practice in
RFC 2046, $5.1.5, but is not illegal

--XYZ

From: cperson@domain.example
To: dperson@domain.example


A submessage

--XYZ--
