moderated Reverse DNS problem #bug


Henning Schulzrinne
 

I can't quite tell where this is happening, but reverse DNS seems to have difficulties, starting a few days ago:

The original message was received at Tue, 13 Oct 2020 13:58:13 -0400
from m0167074.ppops.net [127.0.0.1]
 
   ----- The following addresses had permanent fatal errors -----
<arch-econ@groups.io>
    (reason: 500 Invalid request, no reverse DNS for 148.163.139.74)
 
   ----- Transcript of session follows -----
... while talking to lb02.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 lb02.groups.io.
... while talking to lb01.groups.io.:
>>> DATA
<<< 500 5.5.1 Invalid command

---

host 148.163.139.74

74.139.163.148.in-addr.arpa domain name pointer mx0b-00364e01.pphosted.com.

I tried this from multiple vantage points (Verizon, AWS, a large university, and mxtoolbox).

Henning Schulzrinne

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