Hello,

if policy quarantine will be kept, I propose including this text in the 
specification:

Messages, subject to the quarantine policy, directed to a single recipient that 
does not support the concept of
quarantining, can be either accepted and delivered, accepted and discarded, or 
rejected.

Messages, subject to the quarantine policy, directed to many recipients, some 
of which support the concept of
quarantining, and the others not supporting this concept, can be either:
* accepted, quarantined for the first group of recipients and discarded for the 
other recipients,
* accepted, quarantined for the first group of recipients and delivered to the 
other recipients,
* segmented or
* rejected as whole

Discarding is to be avoided.  Accepting and delivering the message ignores 
completely the DMARC policy.  Segmentation
imposes delivery delays.

This specification recommends in both cases overriding the policy and rejecting 
the message.

Regards
  Дилян

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