以下三张图简要说明Exchange所需要端口，详细端口说明请参考官方文档：
https://docs.microsoft.com/en-us/Exchange/plan-and-deploy/deployment-ref/network-ports?view=exchserver-2019
- Network ports required for clients and services
- Network ports required for mail flow (no Edge Transport servers)
- Network ports required for mail flow with Edge Transport servers