Here you can check the functionality of your website's mailserver, plus check to see if it has been included on any black lists. Many other features are also available.Trying to send email and it just won't go through, or the recipient keeps telling you that no email was received? This is an all too common problem so visit this website and type in your IP (the IP you used to visit the site is already added for you) and it will check your IP against many known blacklists. Blacklists primarily exist to help reduce Spam from circulating around the web by denying access to IP's that have been associated with spam. Now this many not be directly relating to you, but if your website is on a shared server, then you have no control over what other account holders do.