Shouldn't this be marked as duplicate then?
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https://bugs.launchpad.net/bugs/2056443
Title:
CHECK_RCPT_SPF SPF check fails if inbound IP address is IPv6
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Quite possibly related, although the way the error manifests is
different. If the other bug is fixed, then it's very possible this one
will be too.
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Thanks for making this bug report!
This could be related to your other bug[0], but just in-case can you
show how you are configuring exim4, and if you have simple steps to
reproduce this issue, that would be helpful.
[0] - https://bugs.launchpad.net/ubuntu/+source/exim4/+bug/2056372
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