you are using IFTT to send an email, see also this generic IFTTT tutorial
however you are using a predefined key to do this, which means, if that user (which was most probably you) who created that IFTTT Applet, will modify that applet or delete it, the example will not work anymore…
so my recommendation for everyone, who likes to use that example from @Aravind_Chowdary is to set up your own IFTTT applet…