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Investigate Black-listed Exchange Server

A few days ago, our on-prem Exchange 2016 mail server was blacklisted on about 5 different RBL sites (per mxtoolbox).  I reached out to all sites, and requested additional information to determine the root cause.  While waiting for their response, what other steps can I perform to track down the root of this evil?

Port 25 is locked down to only allow server access.  I also checked the Queue Viewer, but only saw about 21 emails in the queue.

What other steps can be performed?

Exchange* RBL

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8/22/2022 - Mon