可以帮我看下这是什么原因引起的退信吗
Subject: Delivery Status Notification (Failure)
Delivery to the following recipient failed permanently:
123@camerichusa.com
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the relay mail.camerichusa.com [209.221.166.20].
The error that the other server returned was:
550 5.7.1 Message rejected as spam by Content Filtering
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