Delivery has failed to these recipients or groups是什么意思

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问题解答：

补充回答：

Delivery has failed to these recipients or groups: luositai@saicmotor.com (luositai@saicmotor.com) Your message is too large to send. To send it, make the message smaller, for example, by removing attachments. The maximum message size that's allowed is 20 MB. This message is 26 MB.
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