I have a Cloudron instance with netcup. The instance is not configured with ipv6. Today i got a Message delivery failure notice with this content: I'm afraid I wasn't able to deliver your message "Your daily summary" to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out. Intended Recipients: <firstname.lastname@gmail.com> Failure Reason: Error: 550 5.7.25 [2a03:xxx:xxx:xxxxxx:xxx:xxx:xxx] The IP address sending this 5.7.25 message does not have a PTR record setup, or the corresponding 5.7.25 forward DNS entry does not match the sending IP. As a policy, Gmail 5.7.25 does not accept messages from IPs with missing PTR records. For more 5.7.25 information, go to 5.7.25 https://support.google.com/a?p=sender-guidelines-ip 5.7.25 To learn more about Gmail requirements for bulk senders, visit 5.7.25 https://support.google.com/a?p=sender-guidelines. To me it feels like: Your hosting provider has attached an ipv6 address to your VPS that you are not using. Sorry, we (Gmail) did a reverse lookup and you (dump administrator) did not create a PTR record for your IPv6 address. Sorry: you are a spammer. IMHO lesson learned: no more vps without configuring for ipv6. Anyone else with a different mindset?

The PTR records of IPv6 and IPv4 are set separately. Cloudron only check for IPv4 (in the status tab). I have a TODO to check the IPv6 PTR record as well . Will do it next release!

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Gmail - ipv6. Anyone else with this experience?

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J Offline
J Offline
joseph Staff
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#21

Can't think of a drawback of disabling IPv6 on the server. You should disable IPv6 on Cloudron side if this got auto-enabled Network -> IPv6 -> Diable. This way it won't configure AAAA records. You will have issues when installing new apps otherwise.
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Gmail - ipv6. Anyone else with this experience?