What a bounce tells you
Hard bounces, soft bounces and complaints, and what Sendaloo does with each.
A hard bounce means the address does not exist: send there again and you only hurt your reputation, so Sendaloo suppresses it. A soft bounce is temporary, such as a full mailbox. A complaint means the person marked your mail as spam: it is suppressed too.
The dashboard shows each message with its events, so you can see which is which.