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The tool checks whether the specified URL, IP address, or mail server IP is listed in DNSBL. Email system providers use this database to filter spam before it finally reaches the end user. For example, if your business uses email marketing and you send thousands of emails promoting your new product, some recipients will mark the email as spam.
Your IP address is very likely to be in the IP blacklist and should be avoided. IP blacklist is a process or method to filter or prevent illegal or malicious IP addresses from accessing your network. This happens when the hosting company permanently ignores your IP address. More specifically, any email you try to send will be blocked and filtered as spam. It is estimated that 80% of email traffic is spam. A large number of commercial e-mails have led to strict blacklist rules to protect mailboxes from spam.