I can confirm the same thing here. But UPC did not contact me off-list until now...
Let’s see if we can skip the exception for them soon...
Von: Rainer Duffner<mailto:firstname.lastname@example.org>
Gesendet: Tuesday, 1 February 2022 14:29
Betreff: [swinog] UPC outbound relay - HELO hostname not in DNS. Can someone at UPC fix
our mailserver rejects mails from servers that don’t send a resolvable HELO-hostname.
As such, customers have been complaining about UPC:
Helo command rejected:
From this posting, although a bit dated:
it looks as if there is some sort of typo or it was simply forgotten to update DNS.
Can someone fix this?
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