As I understand it the argument here is that these IP addresses may expose
internal network topology -

Actually, at this point I don't understand what the IP address is supposed to expose beyond the location of a server which generally tells you nothing new about the location of the user. Perhaps Simon can clarify.

AOL: webmail discloses originating client IP, can't test submit due to AOL brokenness

I managed to configure Pine to send AOL mail, it logs the IP in both the Received: and X-AOL-IP headers. But it uses TLS both on submit and outbound.

So I think it is fine to look at the issues and see where we might make
improvements, but it is a bad idea to rush to naive changes that don't
address real privacy issues but do cause real problems for operations and
security.

Agreed again.

Regards,
John Levine, [email protected], Taughannock Networks, Trumansburg NY
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