Follow-up Comment #1, sr #108704 (project administration):
I think this is an IPv6 problem. The addresses quoted in the log messages are
IPv6 addresses. The remote host alamut.mageia.org rejected the message due to
"cannot find your hostname, [2001:4830:134:6::a]" quoting the IPv6 address of
frontend.
At this moment I am not sure exactly sure where the fault lies but I will look
into it further to try to figure it out.
Notes: A 450 is a temporary rejection suitable for DNS failures which may be
temporary failures. If it works before the message times out then the
delivery may be completed.
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