Experts say instances of vote by mail fraud are rare.
专家称，通过邮件进行投票的情况非常罕见。
2011 English Cafe
The FBI is also involved in " mail fraud" cases, where people are using the United States mail system to lie and steal, usually money, from other people.
FBI 还参与了“邮件欺诈” 案件，人们利用美国邮件系统撒谎并从他人那里窃取（通常是金钱）。
英语百科
Mail and wire fraud
（重定向自Mail Fraud）
In the United States, mail and wire fraud is any fraudulent scheme to intentionally deprive another of property or honest services via mail or wire communication. It has been a federal crime in the United States since 1872.