Emails: sign up for after-the-fact notification

[fulldecent]

New email signup:

You can add as many address as you would like to get notifications about.

Then if any of those addresses is interacting with another address that is (or becomes!) risky they are notified by email.

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This can be especially useful because maybe the address is not risky now, but then I send money to it, and other things happen and then DirtyHash flags the address.

Any browser extension/lookup could not have prevented me from this problem beforehand... but it could at least tell me afterwards.