Yep, T-Online finally just confirmed this for me a bit ago.

Cheers,
Al Iverson

On Wed, Jun 10, 2020 at 12:57 PM Ralph Seichter via mailop
<mailop@mailop.org> wrote:
>
> * Hetzner Blacklist via mailop:
>
> > For the past few years, T-Online have been moving to a system where
> > they block all unknown IPs. [...]
>
> This statement matches what I experienced. Freshly installed mail
> servers (with matching SPF entries) were unable to send email to
> T-Online until I contacted the e-mail address listed in the rejection
> message and asked for unblocking. That never took longer than two
> business days.
>
> -Ralph
>
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-- 
Al Iverson // Wombatmail // Chicago
Song a day! https://www.wombatmail.com
Deliverability! https://spamresource.com
And DNS Tools too! https://xnnd.com

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