https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7761

Bernhard Schmidt <be...@birkenwald.de> changed:

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                 CC|                            |be...@birkenwald.de

--- Comment #2 from Bernhard Schmidt <be...@birkenwald.de> ---
IMO the PublicSuffix list is _the_ authoritative list

https://en.wikipedia.org/wiki/Public_Suffix_List

---
The Public Suffix List is a catalog of certain Internet domain names. The term
is also known by the form effective top-level domain (eTLD).[1] The Mozilla
Foundation maintains suffix list for the security and privacy policies of its
Firefox web browser, though it is available for other uses under the Mozilla
Public License (MPL). 

The list is used by Mozilla browsers (Firefox), by Google in Chrome and
Chromium projects on certain platforms,[2]) and by Opera.[3] Future[which?]
versions of Internet Explorer will also use the list.[4]

[...]
Some uses for the list are:

    Avoiding "supercookies", HTTP cookies set for high-level domain name
suffixes. In other words, a page at foo.example.co.uk might normally have
access to cookies at bar.example.co.uk, but example.co.uk should be walled off
from cookies at example2.co.uk, since the latter two domains could be
registered by different owners.
    Finding DMARC policy records for email subdomains.
    Highlighting the most important part of a domain name in the user
interface.
    Improving the sorting of browser history entries by site.
---

But of course this needs to be carefully evaluated.

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