https://bugs.exim.org/show_bug.cgi?id=3086
--- Comment #4 from Wolfgang Breyha <wbreyha@???> ---
It was:
T:dzsmtp2.iiasa.ac.at:2001:628:21f0:80::80:146:1rrxKe-0000000E15z-21k5 -45
13133 H=dzsmtp2.iiasa.ac.at [2001:628:21f0:80::80:146]: SMTP error from remote
mail server after MAIL FROM:<>: 451 4.1.8 Possibly forged hostname for IPv6:2
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