On 21.10.22 08:03, Johannes Posel via mailop wrote:
>> Am 21.10.2022 um 04:01 schrieb Kai 'wusel' Siering via mailop 
>> <mailto:mailop@mailop.org>:
>>  I dont't talk about Reply-To; it's an irrelevant twist. The real world 
>> szenario is that mailto:some...@t-online.de mails to mailto:i...@verein.de 
>> ("verein" means association, club, …), verein.de does run it's own 
>> mailserver as it's cheaper than using some SP for it. verein.de runs 
>> basically default settings – which usually are good –, thus *not* blocking 
>> mails from @t-online.de, hence mailto:i...@verein.de receives the mail and 
>> reponds to it. *BÄM* 554.

> It would most probably not be a problem with verein.de, which most probably 
> runs a website, and thus already has an imprint stating their board, their 
> register number and court in addition to address and mail or telephone — as 
> they are required by law. That is the trouble with examples.

Verein would still be impacted because having an imprint alone doesn't help. A 
mail operator of verein.de would still have to manually contact t-online.de to 
have their MTA IP addresses added to their whitelist. A distributed system like 
email does not work if everyone has to contact the operators of other MTAs over 
an out of band channel first before being able to send a message.

--
BR Oliver
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