[exim-dev] [Bug 2813] New: exim-4.95: unable to send mail, …

https://bugs.exim.org/show_bug.cgi?id=2813

            Bug ID: 2813
           Summary: exim-4.95: unable to send mail, no host name found
                    loop
           Product: Exim
           Version: N/A
          Hardware: x86
                OS: All
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Networking
          Assignee: unallocated@???
          Reporter: grobian@???
                CC: exim-dev@???

since Exim 4.95, mail cannot be sent from clients, logfile produces large
amounts of:

2021-10-03 10:03:44 no host name found for IP address 2001:X
2021-10-03 10:03:44 no host name found for IP address 2001:X
2021-10-03 10:03:44 no host name found for IP address 2001:X
2021-10-03 10:03:44 no host name found for IP address 2001:X
2021-10-03 10:03:44 no host name found for IP address 2001:X
2021-10-03 10:03:44 no host name found for IP address 2001:X
2021-10-03 10:03:44 no host name found for IP address 2001:X
....

this keeps on repeating until the client times out

The exact same configuration on Exim 4.94.2 works fine, producing a single "no
host name found" log.

It seems the repetition is somewhat random, I sometimes see IPv6 addresses get
through fine, and sometimes IPv4 addresses being reported twice.

Looking through the logs, on Exim 4.94.2 I never saw the "no host name found"
message multiple times for a single connection, unlike with Exim 4.95.

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