Check if a site, domain or IP is not listed in most popular DNS blacklists. Even a healthy site could be included there accidentally or for some reasons. Being listed in DNSBL, site loses its customers and value in search engines. It's crucial to be sure that your site is out of the DNSBL.
In today’s high speed, high pressure and high-stress world it’s utterly important to keep up with things going on with your website. Being well-informed means being in the know of how speedily the monitoring service can contact you - as how will you save the world if you don’t know what’s happened in time?