How should I configure the emailfilter droplet?

[MissyW]

Thanks! 

[dbs]

Hi, you don't need this droplet.
Under Admin-Tools > Frontend Output Filter ... are you right

[MissyW]

Just upgraded to wb 2.8.2.  Can't find any documentation on how to configure and use the emailfilter droplet.  The default droplet just has the following code in it:

Code Select Expand

return '';

Sorry if this is a dumb question, but can anyone explain what it does and how I'm supposed to use it?