I don’t like USPS MOs, never did like them for several reasons (like banks don’t want to cash them), but had a transaction here about a year ago that firmly committed me against them.

Even though my ad said no USPS MOs, this buyer sent a USPS MO. Long story short, his small town post office was using outdated money orders, and when I tried to cash at my post office, it was refused and I was in an immediate discussion and investigation with postal inspectors who said the money order was a fraud. The investigation took about a week before the postal inspectors ate crow and acknowledged the MO was legit and authorized the clerk to cash it.

No postal MOs for me, and I also refuse to pay with one now.