<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><font class="Apple-style-span" color="#243afc">In that case the post office didn't provide any service at all, and there was no obligation to use their service. </font></div><div><br></div><div>Though I don't agree with it, I can see the following rationale:</div><div>Once the stamp was put on, the intention was to have the Post Office</div><div>benefit by it. Therefore, the Chofetz Chayim felt a moral obligation.</div><div>It certainly takes a m'dakdek person to do that but I feel it is most</div><div>remarkable and noteworthy. </div><div><br></div><div><font class="Apple-style-span" color="#243afc">If I walk home, do I have to send the bus company a fare? </font></div><div><br></div><div>No, but if you board the bus and then decide to walk and turn around </div><div>prior to putting the fare in the box and leave the bus, that would probably</div><div>be similar the stamp circumstance. </div></body></html>