Navigate to Administration > Blacklist System, click New, select Email as the type and enter the email address and save.
How to Block a Customer by Email
Go to Administration > Blacklist System.
Click the New button to create a new blacklist entry.
Choose Email as the blacklist type from the dropdown.
Input the complete email address you want to block.
Click Save to add the email to the blacklist.
Tip: You can also blacklist an email straight from a customer profile. Open the customer, click Add Marks, and check Blacklist Only (no chargeback marking) — this adds the customer's email to the blacklist without flagging them as a chargeback.
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