Most internet users have a dynamic IP address when they connect to the internet. But sometimes, users might opt for getting a static IP address from their ISP. There are some advantages of using a static IP address, one of them being it allows users to keep working even if DHCP (Dynamic Host Configuration Protocol) is down. It also helps to run servers on a static IP.
There is a small problem with a static IP addresses, that is sometimes they could be blacklisted on anti-spam databases.
To find out if the IP address assigned to you by your Internet Service Provider (ISP) is blacklisted or not, use blacklist check online tool.
The main reasons why you should be interested in checking if your IP address is blacklisted is that if you are running a server on your system then mails sent from your system might end up in spam folders.
Try out Blacklist Check if you have a static IP and drop in your comments.
Link: Blacklist Check