On Wednesday November 18 2020 09:00, you wrote to me:
>> Other than that, it is my understanding that most of the IPv6 >> network works pefectly well without reverse DNS. It is rumoured that >> mail servers are the exception. >>
TK> Many smtp servers refuse mail from ip addresses without a valid TK> reverse. Both ipv4 and ipv6.
So I heard too. I haven't encountered any problems myself. Now that you mention smtp servers, I have not yet run into an smtp server that supports IPv6...