Abuse emails are email addresses owned by identified email complainers, i.e., recipients known to mark emails as Spam. Abuse emails are detrimental to your campaign, and this is why DeBounce separates them in your reports. That said, you can still send emails to these email addresses if you want to.
Abuse emails are email accounts owned by individuals known for marking emails as spam. This set of recipients are referred to as “complainers.” A MailChimp survey analyzed hundreds of millions of email campaigns and found that companies with between 26 and 50 employees have the least abuse rates – 0.007%.