I am having the same issue. I can see that the email was delivered, but the recipient does not receive the email. I am able to forward the email to him without issue. I am not sure what they have done at their end to try to resolve the problem, but I do know they have been trying to figure out why it won't get through their firewall for a while.
Is there something in the x-headers or somewhere else within the email "package" (I am not technical!) from Marketo that email filters don't like? Anyone?
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We've run into a couple issues like this as well. If your customers are open to whitelisting your company's domain, then you can send that to their IT team to update. Many will not be willing to whitelist Marketo's IPs, however.