is it a good thing to send cash in the mail
Save. The United States Postal Service does not prohibit you from sending cash in the mail, as long as it's not for an illegal purpose. But, it's still not a good idea, especially when sending large amounts of money.ave. The United States Postal Service does not prohibit you from sending cash in the mail, as long as it's not for an illegal purpose. But, it's still not a good idea, especially when sending large amounts of money.