[exim] DMARC incorrect for PayPal ?

Seeing this in the logs for PayPal:

2014-02-28 18:21:57 1WJS4L-000Gsx-8G DKIM: d=paypal.co.uk s=pp-dkim1
c=relaxed/relaxed a=rsa-sha256 i=@paypal.co.uk t=1393611715 [verification
succeeded]
2014-02-28 18:21:57 1WJS4L-000Gsx-8G DMARC results:
spf_domain=paypal.co.ukdmarc_domain=
paypal.co.uk spf_align=no dkim_align=no enforcement='Reject'
2014-02-28 18:21:57 1WJS4L-000Gsx-8G H=mx0.slc.paypal.com (
mx2.slc.paypal.com) [173.0.84.225] Warning: Message from
paypal.co.ukfailed sender's DMARC policy, should reject.
2014-02-28 18:21:57 1WJS4L-000Gsx-8G <= service@??? H=
mx0.slc.paypal.com (mx2.slc.paypal.com) [173.0.84.225] P=esmtp S=9557
id=1393611715.15610@???

PayPal's DMARC checks out.

Any ideas ?