WP version: 3.4.1 Multisite
Notifly version: 1.4
In my case, I prefer not seeing the content of the message, just the notification with the niceHTML wrapper and perhaps an excerpt of the message.
There should be an option to mask the content or pick up the excerpt (custom field?).
There are two reasons: Want people to visit the site and in our case, blogs are private protected by SSL and AUTH but most external emails are not so privacy is required.
I hacked the code a bit to mask the content but I do not have coding experience to make it more sophisticated - leave it to the author and others.