This is a list of all the bounced emails you have sent, complete with the date and the reason why any single email has not been delivered.
It's important to underline that the list is made both by hard and soft bounces (that is, bounces generated by non-existent addresses and for other reasons — for instance, a full mailbox). It includes also all the messages that have been filtered out by the incoming servers, because they have been considered spammy or suspect. To reduce this risk, we strongly suggest to configure our DKIM system.
Remember that turboSMTP will automatically inhibit to send new emails to the addresses on the list. It actually works like an internal blacklist.
Also note that you can edit the list, selecting the single addresses and removing them from the bounce report so that your future messages will be delivered to them.