Mail fraud
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Mail fraud refers to any scheme which attempts to unlawfully obtain money or valuables in which the mails are used at any point in the commission of a criminal offense.
Non-delivery or misrepresentation of mail-order merchandise
This scheme exists in various forms; order an item, make payment, receive nothing is the simplest form of mail fraud. Other variants include misleading descriptions (advertisement says an expensive camera is available by mail-order, when the item arrives it turns out to be a toy camera), deliberate sale of defective merchandise or even stolen merchandise. High-ticket items such as computer hardware are particularly tempting targets for scam artists.
The same scams now exist online; non-delivery of auction or mail-order merchandise advertised on Internet sites is a common complaint.
Another variant involves shipping merchandise which was never ordered, obtaining a signature on delivery (or even COD), demanding payment for the items on the basis that they were signed for at destination.
Promotions selling services or data delivered entirely online are also particularly high-risk; if the "send a money order to Texas, we'll make a few 'phone calls and tell you what your employment references have really been saying behind your back" refuses to deliver as advertised, a fraud may be much more difficult to prove than if the seller is obligated to ship a parcel which requires a signature at destination.
Internet fraud and online auction fraud
Internet fraud or wire fraud schemes may also qualify as mail fraud if the mails are being used at any point in the scheme, including a request that a money order be sent to pay for non-existent or undelivered auction merchandise. Many of these schemes are merely variants on the fraudulent mail-order scams in which the merchandise is never delivered as described or delivered at all.
Online schemes claiming that "a hot female escort will give you access to her entire pornography collection on some Internet site if you send a money order to a drop box in Barrie", if payment is accepted by postal money order and the product never received, would also qualify. The original solicitation is made online, the supposed product claims to be delivered online, but use of the mails at any point (such as to receive money or negotiable instruments) could easily qualify such a scheme as mail fraud.
Impersonation
A number of schemes which misrepresent the identity of the sender, delivering forged documents or bogus requests for personal info (see Bank fraud, Phishing) have also been perpetrated by mail; one version involves sending bogus forms which claim to be from taxation authorities requesting or demanding banking info in order to collect tax on deposit interest. The information obtained is then used in other frauds or in theft of identity schemes.
Promotional cheques
It looks like a coupon and is formatted to appear like a cheque; "oh look, XYZ long distance company wants to send you $10". Look a little more closely and this supposed "cheque" contains slippery fine-print wording which authorises the company to change your default telephone long-distance carrier or incurs other obligations on your behalf.
Solicitations in the guise of an invoice
This is not an invoice. This is a solicitation. You are under no obligation to make any payments on account of this offer unless you accept this offer.
--- PLEASE PAY THIS AMOUNT --->
So begins the wording on some rather slippery documents which look like they're bills or invoices even though they're not. The wording of the disclaimer is taken directly from the US Postal Service Domestic Mail Manual; the intent is to be able to claim that this document is not a fake invoice while still retaining a format which allows a small percentage of recipients to mistake it for a bill and send payment. If the amounts requested from businesses by these "solicitations" are in the hundreds or thousands of dollars, even a fraction of a percent response rate suffices for the scheme to be profitable.
Schemes involving actual fake bills or invoices (such as one where copies of a bogus dry-cleaning bill are mailed to every restauranteur in town with a "your server spilled food on my expensive suit, pay my cleaner's bill" note) have also been used to attempt to take unsuspecting victims to the cleaners.
Get-rich-quick schemes
These take a number of forms, such as the Ponzi scheme or pyramid scheme in which the addressee is invited by a "chain letter" to send money to the first of a list of names and addresses before forwarding the letter to several more people. The person starting the Ponzi scheme claims to have become rich (the infamous Dave Rhodes letter with its claim to have made $50000 is an online variant of this) but the people at the bottom of the pyramid receive nothing. In some cases, every address on the chain letter will be a drop box controlled by the person sending the letters or by one or more accomplices.
Another common get-rich-quick scheme is the Nigerian 419 scam which claims that someone wants to transfer some large amount of money out of their country (or is making a deathbed effort to donate it all to your church or charitable organisation); all you need to do is send all your bank account information and some inflated advance fee to pay for the cost of the transfer or the cost of legal counsel. Of course the massive fortune in foreign money never arrives; the scheme exists to victimise the greedy and the gullible.
Work-at-home scams
The ad claims that a small fortune can be easily earned "working at home", "assembling small products in your spare time" or "stuffing envelopes" (presumably for a few dollars per piece, not the few cents that business actually pay to have a machine do this). Just send $29.95 for more info! Another variant claims that manufacturers are providing sample quantities of laptop computers or other high-ticket items for virtually nothing or that info can be obtained on purchasing motor vehicles for a few dollars at a secret government auction.
The info, if it ever arrives, turns out to be worthless as the easy-money opportunities do not exist as described.
Theft from the mails
Sometimes the mail itself has been the target of thieves; parcels containing merchandise or envelopes with "pay to the order of..." visible in the window are prime targets, as are credit cards or payment cards mailed by banks to their depositors. The most notorious incident of theft of mail was the Great Train Robbery, in which a gang of robbers stopped an entire mail train by tampering with railway signal lights, then robbed the train of registered mail containing valuables being sent by local banks to their head offices.