Dnia 20.10.2022 o godz. 09:32:15 Grant Taylor via mailop pisze:
> 
> Aside:  I wonder if having a provider blocked by default is a form of
> defamation.

I consider this being purely a connectivity thing.

T-Online customers can send mail to any mailserver and they aren't aware of
the fact that they can't get a reply because T-Online has a "default block"
policy, unless whitelisted. They are harming connectivity in a way that is
invisible to their users, doing in fact misservice to those users. The
proposed configuration change only makes this visible and clear, introducing
also default blocking in the reverse direction (unless whitelisted, which
you can always do). I think that a block you know about is "better" than a
block you don't know about.

T-Online customers trying to send mail to other mailservers will hit that
block, and if the reject message will exactly specify the reason - something
like "We block mail from T-Online because they block mail from us" - and the
customer forwards this message to T-Online support, I assume they'll at
least have to explain the situation to the (probably angry) customer. Maybe
over time their will consider changing their "default block" approach.
-- 
Regards,
   Jaroslaw Rafa
   [email protected]
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."
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