You'll need to give a valid E-mail address, to which your key will be sent.

您将需要提供一个有效的电子邮件地址，这样就可以把您的key到其中。

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Facebook requires new members to provide a valid E-mail address before completing registration.

Facebook要求新用户在完成注册前提供一个有效的电子邮件地址。

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For instance, if you require a valid E-mail address from your users, don't make up stupid rules to define what is valid.

例如，如果您需要获得用户的有效电子邮件地址，就不要炮制出一些愚蠢的条款来强硬定义何为有效。

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Even reputable news sites often only check that the e-mail address you have given is valid, but make no effort at all to verify that you are who you claim to be online.

BBC: Microsoft wants to change passwords for something better

Travelocity and the FAA recommended printing out a copy of the reservation receipt, which could be an e-mail message, although it was unclear what would constitute a valid receipt.

CNN: FAA imposes restrictions on e-tickets