Am 07.10.19 um 07:11 schrieb martin f krafft:
Quoting "Wietse Venema", who wrote on 2019-10-06 at 19:13 Uhr -0400:
Perhaps the SMTP client IP address 2001:db8:bad::cafe:: has no PTR
record (or the name does not resolve to 2001:db8:bad::cafe::).
Good point, but the address has a PTR record to a name with an AAAA
record pointing to the address.
Also a wide bug is not to include the ipv6 stuff in SPF, did you checked
this, in the past creating a extra transport for google only via ipv4
was helpfull too
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