如果知道对方姓名，邮件中写上总是好的。如果这是你你第一次写信给某人，可以用下面任意一种方式开头。
It is always better to use somebody's name if you know it. If it is the first time you are writing to someone, use either of the following.
如果知道对方姓名，邮件中写上总是好的。如果这是你你第一次写信给某人，可以用下面任意一种方式开头。
It is always better to use somebody's name if you know it. If it is the first time you are writing to someone, use either of the following.
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