Just reread some of the above dialogue and I believe we're talking a related issue here.
I don't have this rigged up to be triggered by a Rule or anything just yet, I'm using your Device Notification button in the Device Config page. So you suggested to @albertjmulder that he put in an empty line or two at the start of the message. Of course that field under Device Notification doesn't allow for that so I just put an "s" followed by a bunch of spaces and then "sending email from HE". My Subject was HE Msg Relay, and what came out of that exercise was a concatenated subject line...but still no first line content in the email.
Subject: HE Msg Relay s sending email from HE