I have read this help document but I am a little confused: Bounce Mail Management
How many times an email needs to receive an email from marketing cloud in order to be marked as hard bounce? Just once or 3 times within 15 days of period?
Once an email is marked as bounce, Is marketing cloud going to try again to send the email to that email address?
So far, I have been exporting the hard bounces using this method: Bounce Data View
Then I keep the hard bounce in one data extension and use it as exclusion for sending emails from the Marketing Cloud.
So, my question is if Marketing Cloud is already ignoring the emails marked as bounce or hard bounce then is the exclusion step actually needed or not?