On Wed 17/Dec/2025 12:04:25 +0100 Paul Menzel via mailop wrote:
Dear Mail Operators,
Konstantin Ryabitsev, an admin for kernel.org, posted a summary of the
discussions at the maintainer summit [1][2]. They also have a lot of problems
with “major hosts”:
## Continuous degradation of SMTP
We're increasingly having to deal with the degradation of the SMTP support by
all commercial companies:
- major hosts are increasingly not interested in getting mail from anyone
who isn't also a major mail service provider
- their "bulk sender" guidelines are no good for us (e.g. requiring that
we add one-click unsubscribe footers to all email)
- their "spam filters" are increasingly based on training data, which
means that "looks different from what most of our users receive" is
enough to have patches and code discussions put into the "Junk" folder
- they apply arbitrary throttling ("too many deliveries for the same
message-id", "too many messages from the DKIM domain foobar.com")
- anti-phishing services at commercial IT companies do horrible things to
incoming messages
Most people here know that already, but just wanted to share the observations.
In the links provided, I found no suggestions for "developer-safe" mailbox
providers. Instead, they consider web3, lore, and public-mailbox solutions,
"moving away from relying on the increasingly unreliable SMTP layer."
Best
Ale
--
[1]: https://lore.kernel.org/all/20251209-roaring-hidden-alligator-068eea@lemur/
[2]: https://lwn.net/Articles/1050179/
(freely accessible two weeks after release, but it’s just a session
report and contains the same facts as [1])
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