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"Recipient Blackholed"?

Question asked by Kim Parrott on Feb 1, 2018
Latest reply on Feb 1, 2018 by Kim Parrott

Recently noticed a few people in our database marked as 'Email Invalid' with email invalid cause "551 5.7.0 [internal] recipient blackholed".  Any explanation as to what exactly blackholed means would be really helpful.


Thank you in advance!