其次，设置发件人地址和收件人地址数组。

Next, the From address and an array of To addresses are set.

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发件人地址不能为空字符串或只包括空格的字符串。

The sender address cannot be an empty string or a string containing only spaces.

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发件人地址不能为空字符串或只包括空格的字符串。

The sender address cannot be an empty string or a string containing only spaces.

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