I take it you mean as a user not developer?Try these... https://www.google.co.uk/search?…
The problem may be that you've been searching sendto:
The links are "mailto:" links
This guide should help -> http://www.groovypost.com/howto/…
Try turning the internet off.
How do you block email links from opening in gmail.com or imail?
I can't find it on google.