Test whether your mail server is listed in DNSBL and RBL blacklists. Check 150+ blacklists instantly.
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Online Mail Server Blacklist Checker tests whether a specific mail server is listed in one or more of the well known and widely used DNSBL (DNS-based Blackhole List) and RBL (Real-time Blackhole List) blacklists. Having the mail server you use for sending your emails on one or more blacklists may cause that your messages will never reach their recipients. Mail server administrators commonly use tools such as Online Mail Server Blacklist Checker when there is a possibility that their servers have become blacklisted.
When a blacklisted mail server attempts to send an email to a mail server that is protected against spam with a solution that relies on using blacklists, the target mail server refuses to accept the message or even blocks the initial network connection from the blacklisted address. For the blacklisted mail server it is thus impossible to deliver the email to the target mail server.
One of the techniques that spammers use is to hack computers on the Internet and use them as their own mail servers to send tons of spam messages. Every imperfectly protected machine on the network is a potential source of spam. Various IP blacklists attempt to fight spammers by blacklisting every computer that is suspected to be misused by spammers.
The only things you have to do to use Online Mail Server Blacklist Checker is to specify the host name or an IP address of the server that you want to have checked in the Host / IP address field and then to click the "Check!" button. If you specify a host name it will be translated to an IP address before it is checked.