指定发件人和收件人的电子邮件地址、标题和消息。
Identify the email address of the sender and recipient, as well as a subject and message.
未指定发件人。请在“邮件和新闻组”首选项中填写您的电子邮件地址。 收藏。
No sender was specified. Please fill in your email address in the Mail and Newsgroup preferences.
下载图像后，会向垃圾电子邮件的发件人发送Web信号通知，告知收件人的电子邮件地址是有效的。
After the images are downloaded, a Web beacon notification is sent to the sender of the junk email that informs the sender that the recipient email address is valid.
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