what are DUMPSTER folders In Mail
Today upon opening Mail (OS X 10.12.3) I found DUMPSTER folders associated with both of our Comcast mail accounts. One folder indicates 20 items and the other indicates 11 items. Upon opening one of the DUMPSTER folder, there appears to be 100's of emails, with 1 to 20 copies of individual emails. What are DUMPSTER folders and how do you get rid of them?
MacBook Pro (13-inch, Late 2016, 2 TBT3), macOS Sierra (10.12.3)