Many programs must accept E-mail addresses, but correctly handling all possible legal E-mail addresses (as specified in RFC 2822 and 822) is surprisingly difficult.
许多程序必须接收电子邮件地址，但是处理所有可能的合法电子邮件地址(如rfc 2882和822所指定的)令人惊讶的困难。
Many programs must accept E-mail addresses, but correctly handling all possible legal E-mail addresses (as specified in RFC 2822 and 822) is surprisingly difficult.
许多程序必须接收电子邮件地址，但是处理所有可能的合法电子邮件地址(如rfc 2882和822所指定的)令人惊讶的困难。
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