Gmail has detected that this message does not meet IPv6 sending guidelines regarding PTR records and authentication
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I got a problem sending emails to gmail. Apparently Cloudron tries to send them via IPv6, even though I have disabled it in the network settings. But even then, I manually set it up but it still doesn't work. Does anyone else have a similar problem?
Failure Reason: Error: 550 5.7.1 [my IPv6] Gmail has detected that this message does not meet IPv6 sending guidelines regarding PTR records and authentication . For more information, go to https://support.google.com/mail/?p=IPv6AuthError 2adb3069b0e04-5422382618esi2729121e87.370 - gsmtpThe cloudron checks in the E-Mail section are not throwing any errors and neither are external tools. I am not able to recreate this issue on a secondary cloudron instance.
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@nebulon unfortunately this came up again. IPv6 is disabled in the GUI and I had run
sysctl -w net.ipv6.conf.all.disable_ipv6=1but now the server is sending mail via my IPv6 address again, resulting in declines. Google tells me in the error that the PTR record isn't set"message": "Upstream error: 421 4.7.23 [my IPv6] The IP address sending this message does not 4.7.23 have a PTR record, or the corresponding forward DNS entry does not 4.7.23 match the sending IP. To protect our users from spam, mail has been 4.7.23 temporarily rate limited. To learn more about IP address requirement 4.7.23 s for sending to Gmail, visit 4.7.23 https://support.google.com/a?p=sender-guidelines-ip 4.7.23 To learn more about Gmail requirements for bulk senders, visit 4.7.23 https://support.google.com/a?p=sender-guidelines. 4fb4d7f45d1cf-5dc723cedd9si4923716a12.77 - gsmtp",But that doesn't seem to be the issue. Unspam tells me that the email is not signed with a valid DKIM signature, which probably makes more sense.
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@nebulon unfortunately this came up again. IPv6 is disabled in the GUI and I had run
sysctl -w net.ipv6.conf.all.disable_ipv6=1but now the server is sending mail via my IPv6 address again, resulting in declines. Google tells me in the error that the PTR record isn't set"message": "Upstream error: 421 4.7.23 [my IPv6] The IP address sending this message does not 4.7.23 have a PTR record, or the corresponding forward DNS entry does not 4.7.23 match the sending IP. To protect our users from spam, mail has been 4.7.23 temporarily rate limited. To learn more about IP address requirement 4.7.23 s for sending to Gmail, visit 4.7.23 https://support.google.com/a?p=sender-guidelines-ip 4.7.23 To learn more about Gmail requirements for bulk senders, visit 4.7.23 https://support.google.com/a?p=sender-guidelines. 4fb4d7f45d1cf-5dc723cedd9si4923716a12.77 - gsmtp",But that doesn't seem to be the issue. Unspam tells me that the email is not signed with a valid DKIM signature, which probably makes more sense.
@andreasdueren Seems to work again now. I had to enable IPv6 (I think rebooting enables this anyways?) reboot the server, redo DNS and mail server location.
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@andreasdueren Seems to work again now. I had to enable IPv6 (I think rebooting enables this anyways?) reboot the server, redo DNS and mail server location.
@andreasdueren be sure to set your IPv6 PTR too if you've not already done so
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J joseph has marked this topic as solved
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@andreasdueren be sure to set your IPv6 PTR too if you've not already done so
@jdaviescoates Yes I had done that a while ago
