Is there a setting to disable the delivery receipt for all files you send? Instead of having to go to each file in the "Sent Files" list and manually uncheck the "Notify when recipients viewed" box? Currently, in SendNow, you can set that option before even sending the file and the option remains sticky when you log-in the next time.
Adobe Send doesn't currently offer the option to set notification preferences as a default. I can't comment whether that feature will be available later, but you are welcome to continue to use Adobe SendNow if you prefer.
Please let us know if you have additional questions.