A top tip for those struggling to find strings such as these is to download a copy of the free windows grep package – http://www.wingrep.com/
As any Linux buff will tell you, grep is a superb tool for finding strings in files. Windows grep does the same After installed simply right click on the folder where you suspect the string to be and click on the new windows grep tool. A box will open where you type your string (in this case SEND EMAIL. Then click go and it will search through all the files and show you the results including exactly what line of code contains those strings. If you combint it with the free notepad++ (http://notepad-plus-plus.org/ a simple click and the editor will popup and you can simply change your code and test it.
Of course, his assumes you have an install on your desktop or have unzipped the quickstart to a folder on your desktop.