I tried to send a mass mail and ask for preview but that is not showing to me.
Maybe your browser has a popup blocker that blocked it.
The form is there but there is no text in it.
It look likes I have written nothing.
Which browser are you using?
Plus, which version of the mail are you trying to view? HTML or plain text?...
In IE and in Mozilla the preview of html mass mail is not working.
You can send it but the mails came allways as spam to users.
It aslo take a long time to send a plain text mail to 1200 users, it takes about 3 hours.
In 1.2 it was done in 5-10 minutes.