Actually, just mail it with either no postage or one cent postage. It has a high probability of getting through, even if it's international mail. I did some experiments a few years ago, and of the 4-5 I sent every one of them got through.
Crayons wouldn't help anyway, except for maybe fooling people. The postal service machine's actually only look at the envelopes for flourescence which is applied to the stamps. In reality, the stamp's design could be totally blank. However, if the package or letter is an odd size, humans must handle it because it would otherwise jam the machinery - the reason there are now charges for oddly shaped mail. So, if you're scamming the USPS, make it an envelope that will have to be processed by people. Maybe a 1/2 too wide or something like that.
I'm not 100% about this, but I think the machinery spits out the envelope for a human to look at if there doesn't appear to be a flourescent stamp; else stamps from 50+ years ago would be invalid.
One more interesting item: the USPS uses some pretty cool OCR to read the addresses on mail. As I recall it has a 98% accuracy, although I wouldn't be able to find the source.
Crayons wouldn't help anyway, except for maybe fooling people. The postal service machine's actually only look at the envelopes for flourescence which is applied to the stamps. In reality, the stamp's design could be totally blank. However, if the package or letter is an odd size, humans must handle it because it would otherwise jam the machinery - the reason there are now charges for oddly shaped mail. So, if you're scamming the USPS, make it an envelope that will have to be processed by people. Maybe a 1/2 too wide or something like that.
I'm not 100% about this, but I think the machinery spits out the envelope for a human to look at if there doesn't appear to be a flourescent stamp; else stamps from 50+ years ago would be invalid.
One more interesting item: the USPS uses some pretty cool OCR to read the addresses on mail. As I recall it has a 98% accuracy, although I wouldn't be able to find the source.