I am in South Carolina, so I do not know if Oregon counts post dated checks in their bad check laws. The best way to find out is to simply call your local prosecutors office ( district attorney ) and ask. Also, does your business have a policy against accepting post dated checks? In other words, if your published policy is that you do not accept post dated checks, and he sent you one, then you may have legal recourse.

Also, it is possible that the case is actionable, but if the prosecutor isn't willing to pursue it (some smaller jurisdictions won't extradite for misdemeanor charges) you are out of luck. So, finding out how the prosecutor would view these charges ( felony or misdemeanor) is important, too.

The best source of information is the source---the prosecutor who would be the one who would be willing and able to enforce the law if indeed it exists.