Scamming scammers is a dirty trick or not?

No, the scammers don't pay a penny for mailing the fake check to you, they use stolen billing account numbers of innocent people. Then the owner of the billing account number gets a huge bill in the mail or a huge payment taken out of their credit card and they have to call UPS/FedEx/USPS and explain that they didn't send 100+ overnight letters to people all over the country. While what you are doing seems like fun, all you are really doing is causing a headache for some innocent person, sorry.

That being said, if you do like "scamming scammers" you can still do that. Wasting a scammer's time legally and safely is called "scambaiting". If you google that word, you will find sites where you can read scambaits, post up the emails and email addresses of scammers, ask questions and learn all about the hobby of scambaiting.

Also, making a scammer's scam googlable on every scam-warner-anti-fraud-busting site you can find is a great way to slow that scammer down when a suspicious potential victim goes looking for information, finds your post containing the name the scammer is using, his email address, phone number and the emails themselves and then that potential victim does not become a scam victim because you took the time "get the word out".

DO NOT send an email like that. You do realize that it's the Russian mafia who runs most of these fake check scams, and they know where you live if they are sending you checks. They are ruthless and have no problem killing you and your family or firebombing your house if you screw them over

And the scammers are not the ones sending the checks. It's another innocent victim who found a job on Craigslist and believes they are a "personal assistant" for some important international businessman. They are spending their own money on these FedEx shipments, believing they are going to be paid $4000/month by their "employer" and have no clue they are involved in illegal activity or that they will never be paid

I'd keep doing it. The less money those scumbags have the less they can scam others. Keep up the good work.

Fair play. What goes around comes around

you are f@$#& awesome! thats not wrong. its not like they're genuine checks from genuine people genuinely trying to help you or something- you basically are their karma. keep it up!