backstamp
backstamp
(ˈbækˌstæmp)n
a mark stamped on the back of an envelope by a post office to indicate the date and place of its arrival
vb (tr)
to mark with a backstamp
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014