BBNC and BBIS will automatically exclude hard bounces email addresses and invalid accounts from your bulk email or email blast. Hard bounce email addresses are stored in Invalid Accounts. These do not have to be removed from the list manually.

For the most up-to-date information regarding how the system excludes addresses from Processing, consult our Email Resource Center: 

https://docs.blackbaud.com/email-resource-center/faqs/processing#which-email-addresses-are-automatically-suppressed-from-mailings