If you wish to test the effectiveness of two different Autoresponses, you CANNOT do so by merely “Pausing” one whilst trying the other.
“Pausing” an Autoresponse does NOT turn off all of the interfaces established between the List and the Autoresponse , that merely pauses them whilst you make a modification.
There is however a simple solution.
Using the “Campaign Copy” (cc) function, create a copy of your original Autoresponse. That function creates a direct copy but in Draft form, i.e. it has not been “Activated” on the “Confirmation” page. Now DELETE the original Autoresponse. Then create your alternative Autoresponse and “Activate” it to go out to all future subscribers.
If at a later time you want to revert to the original Autoresponse your simply Delete the second alternative one and “Activate” the Copy of the original one.
If you do not follow that simple procedure your second Autoresponse will go out to all your existing subscribers as soon as you “Activate” it.