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system
is it safe to accept money in the mail?
user
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.
assistant