Die Zustellung von E-Mails über zoho-Mailserver an arcor.de-Adressen funktioniert seit einigen Wochen nicht mehr. Man erhält folgende Fehlermeldung zurück:
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error.
[xyz]@arcor.de , ERROR CODE :450 - 4.7.25 Client host rejected: cannot
find your hostname, [136.143.188.52]
Reporting-MTA: dns; mx.zohomail.com
Arrival-Date: Fri, 29 Mar 2024 09:51:33 +0100
Original-Recipient: rfc822; [xyz]@arcor.de
Final-Recipient: rfc822; [xyz]@arcor.de
Status: 450
Action: failed
Last-Attempt-Date: 2 Apr 2024 08:39:47 GMT
Diagnostic-Code: 4.7.25 Client host rejected: cannot find your hostname, [136.143.188.52]
Remote-MTA: dns; mx5.vodafonemail.de
Auf Nachfrage bei Zoho habe ich folgende Antwort erhalten:
Upon reviewing our logs, the emails sent to @Arcor.de were rejected with the error message "4.7.25 Client host rejected: cannot find your reverse hostname, [136.143.188.15]." This rejection occurred because the recipient server refused the email due to our sending IP address not resolving to a hostname.
Despite our IP address having Full Circle Reverse DNS (FCRDNS) configured successfully, the recipient server still rejected the emails. You can verify this configuration using the link provided below.
https://www.blacklistmaster.com/reverse-dns-test?ip=136.143.188.52
To fix this we suggest you to contact the recipient email hosting provider and they will be able to fix this. Do revert us in case of further concerns.
Es wäre super, wenn Sie das Problem lösen könnten.
