Does anyone know why the SMTP server for this list doesn't reverse resolve?

I'm thinking of turning on mandatory reverse resolve to cut down on the
volume of junk hosts connecting from and I noticed that doing so
would stop delivery from this mailing list.

Does anyone know if reverse DNS of a connecting SMTP server is outlined in
any of the SMTP RFCs?

If so, I'd like to reference the RFC in my error message.


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