13K are coming back as deliverable
If 13K came back to you, then you already know their addresses are "UNdeliverable."
Write a SQL query and execute it within the CONTROL PANEL > DATABASE TOOLS > SQL COMMAND page.
Similar to the following:
update ubbt_USER_PROFILE
set USER_ACCEPT_ADMIN_EMAILS = 'off'
where USER_REAL_EMAIL = 'mail@example.com'
mail@example.com would be where you insert the address you wanted to disable admin emails for. Do this for each address.
