A listing in DroneBL is NOT always related to spam. But in most cases because of an open proxy !!!
Details about 173.49.74.199
Country: United States of America (US)
Reverse: pool-173-49-74-199.phlapa.fios.verizon.net
Autonomous System Number: AS701
Lookup results for 173.49.74.199
No specific incidents regarding 173.49.74.199 were found in DroneBL's incident tracking system. This means that your IP is not listed in DroneBL.