你好,
这个可能是由于传输服务可以打开的最大传递线程数过低导致,你可以尝试下面的指令增加该数值看是否有帮助:
Set-MailboxTransportService -MaxConcurrentMailboxDeliveries 100
Set-TransportService -MaxConcurrentMailboxDeliveries 100
谢谢!
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Niko Cheng
TechNet Community Support
