On Tue, 18 Feb 2020, Matt Palmer via mailop wrote:

great, but it's an unfortunate side-effect of providing anonymity. Frankly, if you were feeling up to the job of scripting it, pre-emptively putting all Tor exit nodes which allow connections to port 25 in your RBL would not be a bad idea (exit nodes and their exit policies are publicly available, so you could scrape the list and maintain RBL entries based on it).

Asking tcp/25 only might be more complex, but there's a starting point:

        https://www.dan.me.uk/dnsbl

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