Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Is it safe to accept money in the mail?
The US Postal Service to my recollection recommends only mailing cash or items with cash-like characteristics using Registered Mail service. Registered mail is expensive and a pain in the butt for everyone, as it requires an audit trail for each individual who touches the mailing.  If you're doing a lot of business and word gets out that you're accepting cash payments via the mail, you'll probably attract unwanted attention from the tax authorities as well. It's fairly unusual.