We are aware of the issue with the badge emails resending to everyone, we apologise for the inconvenience - learn more here.
When sending a file through Dropbox Transfer, you get notified everytime a file will expire within 2 days. When you send all of your work to your clients through Dropbox Transfer, you get quite a lot...
Please allow an option for controlling/disabling email notifications related to Dropbox Transfer - specifically "You're transfer is complete" emails. This could be added to the already-existing Notifications area within Dropbox as a simple toggle.
Excess notifications can be redundant on its own, but especially when working with a team/shared distribution email, having multiple instances of email notifications that may only pertain to one person, sent to everyone, is simply unnecessary.