Your mail server blacklisted? how to know that is your mailserver being blacklisted? and how to remove blacklist to your mailserver?

Maybe you’re very frustrating while you or your client hosted on your server cannot send email to some email address or your message listed as SPAM in several mail servers.

Some of mail server using RBL (Black Listings) services to prevent undesired email. most mail server software can be configured to reject or flag messages which have been sent from a site listed on one or more such lists.

Here’s a list of different kinds of DNS Lists.

White List - IP is a trusted email source
Black List - 100% spam. Message should be rejected.
Yellow List - Message comes from a mixed source and IP should not be tested further
NoBL list - IP is not a spam source but may be a ham source

To check whether your mail server blacklisted on RBL List, you can try free tool from www.mxtoolbox.com , this tools will check a mail server IP address against 147 DNS based email blacklists. Complete with link how to remove your mail server IP from blacklist.