On 30 Dec 2019, at 02:44, Keith Moore <moore(_at_)network-heretics(_dot_)com>
On 12/29/19 9:31 PM, John R Levine wrote:
So they're not subject to outside scrutiny. No wonder email delivery is so
Aw, come on. They have a billion users who vote with their feet if they're
Sure, because changing email addresses (or services, for those who have their
own domain names) is easy for everyone.
30% of email addresses on a marketing list go bad every year. It doesn’t seem
that changing email addresses is that problematic.
But yes, my response was a bit flippant. I do acknowledge that there's a kind
of expertise that people who deal with large volumes of traffic on a daily
basis, have, that others generally do not have.
Nothing personal but I cannot imagine why someone running a large mail
system would care what you or I thought of their filtering scheme. They
have way more data than we will ever have.
I'd be curious as to their measurement methods, but I suppose those are also
There is an entire sub-section of computer science publications (many of them
peer reviewed documents, others whitepapers, still others theory document) that
address these issues. Perhaps a few hours with google or at your local library
will give you some insight into the research being done and published.
Both Google and Microsoft also publish information about what they’ve learned
about filtering and how they address issues. A recent google post:
And an older post, but one that I think addresses a lot of the issues addressed
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