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On Mon, Jul 05, 2021 at 09:23:03AM -0400, Polyna-Maude Racicot-Summerside wrote:
> Reporting-MTA: dns; premium58.web-hosting.com
> Action: failed
> Final-Recipient: rfc822;bjoern.ricks@greenbone.net
> Status: 5.0.0
> Remote-MTA: dns; mail.greenbone.net
> Diagnostic-Code: smtp; 550 X-Host-Lookup-Failed: Reverse DNS lookup
> failed for (failed)

unicorn:~$ host domain name pointer cyrania.com.
unicorn:~$ host cyrania.com.
cyrania.com has address
cyrania.com has address
cyrania.com has IPv6 address 2606:4700:3031::6815:3beb
cyrania.com has IPv6 address 2606:4700:3031::ac43:b96d
cyrania.com mail is handled by 0 _dc-mx.f1202d9a4fb3.cyrania.com.

Your "reverse" (PTR record for doesn't match.  Which is
to say, none of the "A" results from cyrania.com. match the original
IP address of

Some SMTP receivers may care about that.  Apparently the receiver for
greenbone.net (whose name is mail.greenbone.net) is one of them.

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