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.
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.
在指定了管道跟踪发件人地址后，必须启用管道跟踪。
After you specify the pipeline tracing sender address, you must enable pipeline tracing.
如清单5 所示，Email对象包含了诸如发件人地址、收件人地址、主题栏和消息正文等属性。
The Email object contains properties such as the sender's address, the recipient's address, a subject heading, and a message body, as shown in Listing 5.
因为你已经确定我推断是三列以确定唯一性(主题行，主体和发件人地址)，所以您将创建包含所有三列的索引。
As you've identified what I infer to be three columns to determine uniqueness (subject line, body, and sender address) you'll create the index to include all three columns.
因为你已经确定我推断是三列以确定唯一性(主题行，主体和发件人地址)，所以您将创建包含所有三列的索引。
As you've identified what I infer to be three columns to determine uniqueness (subject line, body, and sender address) you'll create the index to include all three columns.
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