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The blacklist check will test a mail server IP address against over 100 DNS based email blacklists. Commonly called Real-time blacklist, DNSBL or RBL. If your mail server has been blacklisted, some email you send may not be delivered. Email blacklists are a common way of reducing spam.
A website could get on a blacklist if the website owner decided to send out emails promoting a new product to thousands of people. If one or some of the receivers of the mail marks it as spam, the email service provider might place the website on a blacklist. In a different scenario, if you see that your regular site visitors have dropped off and the traffic to your site has stopped; one of the reasons could be that your website has been blacklisted. Also if someone is offering to sell a domain to you; you must check and see if that domain is blacklisted or not.
Some organizations are running the blacklist service on the internet. Email service providers check if a website is blacklisted with DNSBL or SURBL. Email service providers use these services to try and eliminate spam mail before it reaches the user. Some DNSBL service providers use a variety of criteria to list and delist website addresses. Spam filters used by email service providers use DNSBL services as the first line of defense. SURBL is not the first line of defense in checking spam mail. It contains a directory of websites that have been blacklisted for appearing in the text of spam emails. Both these methods are used by email service providers as their first line of defense against spam mail.
We have explained the reasons why a website can get blacklisted. We have also introduced you to a handy tool to use to check if your website is blacklisted. You must take the measures required to protect your website against malware, viruses, and hackers. There are some tools available to protect your website.
Also never get lured into using any links from unknown sites. You should regularly check your backlinks and ensure that they are coming from ‘clean’ sites. While millions of legitimate websites exist, there are some very vicious people out there who try to hack and misuse websites. You must remain aware of them. In case any of your site visitors complain that they cannot see your website; check it immediately and ensure that it has not been blacklisted.