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McAfee Spam Filter Causing Illegimate Bounce

Question asked by Chris Vandermarel on Jun 11, 2014
Latest reply on Jun 11, 2014 by Adam Edwards
Some of our contacts with legitimate email addresses are bouncing getting the following error:

551 Mailhost is on our global block list. See

It seems Marketo's IP was temporarily blocked by McAfee. This leads me to two questions:
  1.           Has anyone else encountered this? Can any action be taken to counter this?
  2.           Now I have contacts with Email Suspended marked true. Will Marketo try again to send to them later? If rejected again will they become Email Invalid?
Thanks in advance!