We resolved an issue where the default UTM_source in the email editor showed a plus sign ("+") instead of an underscore ("_") in the Google Analytics > Source dialog.
Yahoo! email preview events
We made a change to the way we handle Yahoo! link preview events. Previously, we indicated automated Yahoo! email platform clicks as clicks and opens in Act-On. We have changed the way we portray these events and now consider them automated events. This will affect open and click metrics for Yahoo! mail recipients.