Hi Rainer 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... Regards, Beat Von: Rainer Duffner<mailto:rainer@ultra-secure.de> Gesendet: Tuesday, 1 February 2022 14:29 An: swinog@lists.swinog.ch<mailto:swinog@lists.swinog.ch> Betreff: [swinog] UPC outbound relay - HELO hostname not in DNS. Can someone at UPC fix this? Hi, our mailserver rejects mails from servers that don’t send a resolvable HELO-hostname. As such, customers have been complaining about UPC: 450 4.7.1 <vie01a-dmta-ch01.mx.upcmail.net<http://vie01a-dmta-ch01.mx.upcmail.net>>: Helo command rejected: https://www.mail-archive.com/swinog@lists.swinog.ch/msg06676.html it looks as if there is some sort of typo or it was simply forgotten to update DNS. Can someone fix this? Rainer -- This message was scanned by ESVA and is believed to be clean. Click here to report this message as spam.<http://cable01.eichenberger.net/cgi-bin/learn-msg.cgi?id=>