Any response we receive from recipient mail server is categorized as “Other Bounced” by our system if we don’t have a
defined reason mapping in our system. Currently we map most of the responses into proper categories (Soft Bounced,
Hard Bounced), but there are literally thousands of different responses from too many mail servers and some of those
are missed by our system mapping. Although clients cannot do practically anything on their side, we can keep improving
our system mapping over the time to include new and unknown responses/reasons.