What happens to messages after its gone from the queue?

Hi all,

just wondering if anyone knows what happens after a Message leaves Message Queue?

Our scenario is this:

Hybrid configuration With Exchange online and Exchange 2013 server.All MX records Points to Our on prem server,but Messages sends directly from Exchange online.

We had one user where remoutrouting address was incorrect,but it is now correct and external mailflow is working again.Seems like old Messages are not delivered,only New ones.

Wondering if its possible to resend those Messages from the Queue or logs?

thanks!

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