Email Preview option - When is this being implemented

Hello,

I just wanted to check and see when the option to Preview Email will be implemented?
Any general plans on releasing this?

To save time, I use merge fields for Prospects Names and Business names.
I use them so I don't have to type out or copy and paste the the whole name.
If one letter is off for whatever reason, the merge field value doesn't work.

How do we get a way to do this?

I want a way to preview my email and make sure the merge field values work.
That way I can save time and not appear disingenuous.

Please advise.
This would make my life so much easier and accurate.
I asked this question 3 weeks ago but have yet to receive a response.