We see some issues with Shadow queue accumulating on one of the servers, it seems to be related to the fact that Exchange servers have been added to internal FrontEnd relay connector:
https://practical365.com/exchange-server/no-need-create-connectors-internal-exchange-server-mail-flow/
We see that this server is not cleaning shadow often enough - look for code XQDISCARD
in the hub smtp logs on other servers:
https://docs.microsoft.com/en-us/exchange/mail-flow/transport-high-availability/shadow-redundancy?view=exchserver-2019
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