Can you give me more information regarding the blocklist issue?
Unfortunately, we can only provide you with whatever information the blocklist provided to us. This information should all be included in the notification email you received from us. If that notification did not contain any information about the email campaign that triggered the blocklist issue, please contact Support.
Additional Resources:
Can you give me the spam trap address that triggered the listing?
What is a spamtrap, or spam trap, and why does it matter?
How does Marketo respond to bocklisting and spam notifications?