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The Blacklist Lookup will test a mail server IP address against over 100 DNS based email blacklists. If your mail server has been boycotted, some email you send may not be delivered. Email boycotts are a typical method for decreasing spam. If you don't have the foggiest idea about your mail server's address, begin with a Blacklist Lookup.
These frameworks are utilized by email framework directors to attempt and kill spam email messages before they achieve their clients.
Return Path has an official rundown of email server IP addresses that show action that takes after spammers. This boycott is generally utilized and in light of ongoing information from Return Path's helpful Global Reputation Network.