Send the return message back to the address that sent the original message and log it.
将返回消息发送回发送原始邮件的地址，并记录下来。
The service provider (such as the Donor Group application) does not send a return message.
服务提供者(例如DonorGroup应用程序)不发送返回信息。
The service provider (such as the Donor Group application) does not send a return message.
服务提供者(例如DonorGroup应用程序)不发送返回信息。
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