I am currently using NVDA version next-13407,bb103e63 on windows 10 insider build 14372 in case that makes any difference. In multi-line messages in mail, nvda only reads the first line of the message. To reproduce, do the following.

1. Create a new message to your self and type at least two lines of text in the body.
2. Open the message when it arrives. Expected results: NVDA should read all the lines in the message.

Actual results: NVDA only reads the first line.