@Dave-Swift said in Hetzner PTR Record Invalid:
PTR record is in tact and correct.
@Dave-Swift said in Hetzner PTR Record Invalid:
PTR record began showing as invalid on tools like MXToolbox and WhatsMyDNS. Since then, all outgoing mail has been rejected by recipients, with the failure message indicating that the PTR record is not configured correctly.
I wonder if it's these tools that are failing/ getting it wrong. I note the I seem unable to check DNS or rDNS stuff on Hetzner using MXToolbox recently. Perhaps Hetzner are blocking it at their end or something.
Could be that your mails getting undelivered is unrelated. Are you on Hetzner Cloud? Have you checked if you're on spam blacklists? In the past I've ended up on blacklists because I was in the same range of spammers.