Snail Mail Too
Ever since I moved into my house 6 years ago, I've received the monthly Talk Talk bill for one of the previous occupants who moved out 15 years ago. For the first year I wrote "return to sender - no longer at this address" on the envelope in the vain hope that someone would at least think to contact the said customer, but no. To this day I dump them straight into the recycling unopened.
As as for the email woes described above, I simply set up filters to move them to the junk folder and mark them as read. And random SMS senders get given a silent notification tone, so at least they don't disturb me. In fact, the banks get the same treatment as they insist on messaging me my balance alerts in the middle of the night (i.e. before 9am)