请问谁知道Bulk Email senders是什么意思？另外往Gmail发信有退信
退信内容如下：Our system has detected an unusual amount of unsolicited
550-5.7.1 mail originating from your IP address. To protect our
550-5.7.1 users from spam, mail sent from your IP address has been
550-5.7.1 rejected. Please visit
550-5.7.1 [url=http://www.google.com/mail/help/bulk_mail.html]http://www.google.com/mail/help/bulk_mail.html[/url] to review
550 5.7.1 our Bulk Email Senders Guidelines. j7si6878470wah
英文不太好，打开了不太明白些的是什么内容，bulk mail senders 是什么意思呢？ 应该是大量邮件发送被当成垃圾邮件被挡了。
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