@Tutanota Yes. They do.

And Yahoo® introduce an stupid, but efficient way, to reject mails comming from properly configured smtp server (fixed ipv4&6, spf, ptr, dkim, dmarc, etc and off course not sending spams) … they check if the @domain.tld have an SOA.

Meaning that free / libre (sub)domains like *.nohos.st, *.ynh.st, *.nohost.me are rejected because the SOA il not on the sub.domain.tld.

And it's not the only thing.

Blacklisting / greylisting servers with a « low reputation » −a server seen forst the first time and sending 2 mails a week is have a « low reputation » … because it's just new and unknown, is an other attemps to kill independant mail hosting.

Those corporation are killing Internet.