Response to a routine delivery?

HAHA

What you might text back when someone sends you a joke that’s been around for years.

This clue plays on the double meaning of "delivery." In comedy, a "delivery" refers to how a joke is told, and a "routine" is a stand-up comedian's set. So a "response to a routine delivery" isn’t about mail—it’s the audience’s laughter, often written as "HAHA" for short. The humor comes from treating a comedy term like a literal package arrival.