When sending Invoices and Estimates we currently have a box to type in Custom text. The problem is that I may want to slightly customise the template wording on the fly for a particular email, or I forget what the current template actually includes and often waste time checking the template before I send.

If there was a "Preview" email function which showed the full email layout including tags converted to data, which happens in the background anyway, it would be awesome and a great time saver.