transformer secondary ringing

Hi,

I am using a fullbridge SMPS, and when I scope the secondary of the transformer I am noticing a lot of voltage ringing which is approaching the breakdown voltage of the diodes (600VDC). I have RC snubbers across the primary coils, but none yet across the secondary. LTspice shows that if I remove the primary RC snubber the output ringing is reduced, what other methods are there to reduce output ringing or to protect the diodes besides using an RC snubber?

cheers,
Jamie
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