I have set up a development site to auto update with the beta tester plugin.
But as you might well imagine it sends out a lot of emails…
I looked into the post Nacin wrote on the The definitive guide to disabling auto updates in WordPress 3.7
And he wrote about how to:
6. Manipulate whether notification emails are sent
And I wanted to set something up so on my beta site so it continues to update daily but only email on a fail, but I am not quite sure how to set up the filter so it did just that?