How to mock http request of a module or a module

I am using a module for sending email. (I did not created this module).

I want to test my app with the module. But I don't want to send email each time I test, so I thought to use this: http://ift.tt/1b56TlO

(This let you fake http request, and record the answer for later).

Now the question. I a am forcing the email module to use node-reply, instead of regular requests methods.

I don't want to change the email module.

Is it possibile?