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moderated Mail server reverse DNS still flakey #bug
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Sorry, I missed the Gmail indication and actually thought it looked like a spoof attempt. If you're using G Suite and Proofpoint email proxy services, then this is not a normal situation at all. That said, line 3 certainly seems to indicate lb01 was unable to retrieve RDNS for 148.163.139.74 at the time of that transaction. I am also wondering if you're saying this is all from one transaction because it looks like several? --
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No, the problem persists as of 10 minutes ago. I can send email from the same account to dozens of other destinations, without any difficulty - it's only groups.io that fails. It's indeed Proofpoint, a very large email security company used by lots of large organizations (https://www.proofpoint.com/us/products/email-protection). If there was a larger problem, thousands of employees at my organization would quickly complain...
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Hello, The email is coming from 148.163.139.74, which isn't Google. It appears there was some sort of DNS hiccup from them yesterday. I believe it was temporary. Thanks, Mark
Mail server lb01.groups.io is at 45.79.81.153 and lb02.groups.io is at 173.255.221.194 where both belong to Linode. (Links are to ARIN pages)
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Mail server lb01.groups.io is at 45.79.81.153 and lb02.groups.io is at 173.255.221.194 where both belong to Linode. (Links are to ARIN pages)
IP address 148.163.139.74 belongs to "PROOFPOINT-NET-NORTH-AMERICA" so that's not the correct address. Something else is wrong. Perhaps the issue is DNS at your provider or some kind of proxy. -- Jim
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while talking to lb01.groups.io.:
>>> RCPT To:<arch-econ@groups.io> <<< 500 Invalid request, no reverse DNS for 148.163.139.74 554 5.0.0 Service unavailable 451 4.4.1 reply: read error from lb01.groups.io. ... while talking to lb02.groups.io.: >>> DATA <<< 500 5.5.1 Invalid command This is from gmail, so not a fringe service...
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