A listing in DroneBL is NOT always related to spam. But in most cases because of an open proxy !!!
Details about 91.217.4.97
Country: Russian Federation (RU)
Reverse: static.luga.net.ua
Autonomous System Number: AS39728
Lookup results for 91.217.4.97
No specific incidents regarding 91.217.4.97 were found in DroneBL's incident tracking system. This means that your IP is not listed in DroneBL.