They'll probably send both a certified letter (which you must sign for) and a regular letter, regarding the fine and delinquency. It WILL show in your credit report as a judgement against you, which doesn't look very good. You won't just be able to get it off your report by going to the CRA's and arguing you never got a letter. You would need to actually go back to court and argue you never got both letters (good luck with that), and you would have to prove that the mailing system didn't work twice with you. Which is of course impossible since the regular letter won't come back as returned and you will probably refuse to sign for the certified one. So basically you will be stuck with that fine. My advice is to just go to court, that way you don't have to pay a fine and you do your duty as a citizen.