Hello Giovanni,
In Real Estate Manager -> Setting -> Email Notification - together with every email option - you see example email with {placeholder fields} -these {placeholder fields} will replaced to real fields data at time email send.
Self email text - you may replace with help Real Estate Language manager.
Add new placeholders possible only with help code edit.
If you need some special. Please send customization request with help OrdaSoft contact form
Thanks,
Andrew