SERVICE SEEMS RECOVERED as of 8:09pm EDT Oct 27, 2022
It looks like lots of complaints finally got a change made -- the hotmail MX
records have removed IPv6 records from DNS, and now all of our 945 delayed
emails are delivered.
The records were removed sometime between 6:49:28pm EDT
At Oct 24 21:06:13 UTC, after years of being IPv4-only, Microsoft Hotmail
published two IPv6 records for the hotmail.com MX record.
Great! Progress! Hurrah!
Except that one hour later, Oct 24 22:00:57 UTC, our IPv6 address was
blocked, after just 9 emails sent, as "spam."
Prior to this date,
Been doing exactly this for a couple ASNs for a few years now with
surprisingly good results (thanks to advice way far back from my good
friend Brandon Martin above, coincidentally). One of them is even on an L3
switch with something like 96k max routes. Taking defaults from two
upstream providers
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