How does a court system know whether you received a jury duty summons or not?

Question

I've received one jury duty summons before, and I responded accordingly. They had me call a couple of numbers, and I didn't have to provide any personal information, just a couple of recordings telling me and my group to stay home.

I've always wondered how the courts can be sure that you actually receive a jury duty summons through the mail. What if the summons gets lost or misdelivered? How can they punish someone if they never received a summons in the first place?

And furthermore, if failing to respond to a summons gets you in trouble, how can the courts argue against a defense such as this (I never received any sort of summons through the mail!). Any input appreciated.

Answer 1

A return slip showing the delivery of the summons is made to court by the post office.