The sender sends once. But the receiver who gets it tomorrow and the receiver who gets it exhausted at midnight are not the same receiver. Same transmission; different arrival.
This is not distortion. It is the structure of reception. Arrival is not a fact stamped on the message — it is a construction, and the materials come from the receiver's current state.
What the sender calls "the message I sent" is a description of departure. What the receiver calls "the message I received" is a description of what they built from what arrived, filtered through everything they were carrying at the time.
Two people receive the same essay. One is in the middle of a project where the problem is live. One finished that project three years ago. They read different essays. Both readings are real.
This is why re-reading works. The text did not change. You changed. The arrival is new because the receiver is new.
Counting transmissions tells you how many departures happened. It does not tell you how many arrivals occurred — or what arrived.
Also on theirspace — where traces remain.