On Thu, 20 Oct 2022, Kai 'wusel' Siering via mailop wrote:
[...]
Basically "Max" states that he needed to put an "simple imprint" at
http://his.do.main/index.html, which made t...@rx.t-online.de whitelist his
mailserver's IP. Thus, even in December 2020 they were keen on this imprint
thingy; why it didn't happen with you before, I cannot tell.
Fair enough. Maybe it was just luck..
[...]
Since t-online.de is the only "walled garden mail domain" known – at least
AFAIK? –, any email to and especially from @t-online.de should be rejected in
any default configuration of any MTA. This reflects the discussed fact that
one has to register one's mailserver with t...@rx.t-online.de _before_ any
mail exchange can happen. It's not a "form of defamation", as Grand Taylor
stated, it's the only proper local configuration for the rather special setup
used at t-online.de.
Our server, our rules -- that's valid too.
However, I still find that Postel's law should apply, in any context, and
specifically in this one. You want to run an e-mail server and don't want to be
blocked, so you should (liberally) accept, instead of "being like them" and
block unfairly (for some definition of fairness anyway).
After all, this is what we (should) teach our kids, so I'm a bit surprised that
some people are proposing (or have already implemented) doing the eye-for-an-eye
(or was it a tooth?) to T-Online.
*We* can do better, and we should do better ;-)
Kind regards,
Bernardo
PS: I'm afraid that this topic might be uninteresting and/or annoying to those
around here working for larger operators, who are (or should be) wholly
unaffected by this, so I apologize for my contribution to the increased volume
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