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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