Is it permissible to deliver and receive daily mail for a bank that deals with usury for a wage?

If a bank is usurious and operates with usurious transactions, it is not permissible to work with it, whether in mail delivery or other capacities, because doing so constitutes assisting in the forbidden usury. This is based on the saying of the Prophet (peace be upon him): "The Messenger of Allah (peace be upon him) cursed the one who consumes usury, the one who feeds it, its scribe, and its two witnesses." And he said: "They are all equal."