An update - I just sent 7 messages in quick succession to my Yahoo account, to test. Six arrived immediately, and 1 was delayed by a couple of minutes at most.
All mail from my main domain on Viking were "passed" by domainkeys.
One message from my sub-domain on Viking arrived immediately, but there was the permerror (no key) in the domainkeys field.
The one message from my domain on liverpool also arrived immediately, despite not having Domainkeys configured.
Go figure!
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