Gloom of night

"Neither snow, nor rain, nor heat, nor gloom of night stays these couriers from the swift completion of their appointed rounds." Hah! Gloom of night long since arrived, and the mail has not been delivered. This happens here in Austin from time to time, usually when the branch is short-handed before or after a holiday so that, even with remaining carriers sharing out the uncovered routes, some mail is not delivered. It isn't worth it to call the branch. The response always is that there probably was no mail for that address. There's never no mail for this address.