If a portion of the list has hard bounced, are they omitted from the list automatically?

If a portion of the list has hard bounced, are they omitted from the list automatically?

It is tough to know for sure why, and we want to clean up our list so it has no hard bounces at all., but are hard bounces automatically taken out of the main list in the case that we wish to do another mailing with this list before the months end/