On 2025-02-06 11:31, Chris Spencer via mailop wrote:
Via an include the problem will go away as the IP6 will no longer form
part of the hostname which I suspect is the issue here. We’ve likely
fallen foul of permitted characters per rfc1035
Permitted characters? How so?
An email sent by 2a0d:7c40:3000:3d9::2 from fortra.com would expand
%{i}._i.%{d}._d.espf.agari-dns.net
to
2.a.0.d.7.c.4.0.3.0.0.0.0.3.d.9.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2._i.fortra.com._d.espf.agari-dns.net
which is valid.
Michael
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