I send one-to-one emails (not marketing campaigns) to Contacts and sometimes the address is wrong. My Outlook email inbox is connected, so I get notified through my Inbox. But is there a way HS can also notify me and record it in that individual's contact record for future reference?
I would also like to mention that HubSpot does not provide list cleaning services as a permission-based sender. It's recommended to remove inactive subscribers, consider a re-engagement campaign, or engage a third-party service scanner to clean your list.