Hello Jan,
The other curious thing is that mail.h-email.net has
only IPv4 addresses (in Digital Ocean and Hetzner),
but h-email.net has an SPF policy that only allows
IPv6 connections:
$ host mail.h-email.net
mail.h-email.net has address 178.62.199.248
mail.h-email.net has address 165.227.156.49
mail.h-email.net has address 165.227.159.144
mail.h-email.net has address 5.75.171.74
mail.h-email.net has address 5.161.98.212
mail.h-email.net has address 167.235.143.33
$ host -t txt h-email.net
h-email.net descriptive text "v=spf1 ip6:fd96:1c8a:43ad::/48 -all"
Disposable email services.
10minutemail[.]pro
10minutesmail[.]net
And so on ...
Bye, Raymond
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