Thank you for posting here in the Community, @doit5225-.
I'd love to help you with your concern about removing a collection agency email in QuickBooks Online (QBO). But can you please provide more information on where it was attached? Is it attached to an invoice or the company file? Any additional details would help us provide the best resolution on this matter.
Please know you can continue to reach me here with your additional questions. I'll be standing by for your response.