Scientifically proven to solve precisely 99.3% of all technical problems faced by modern civilisation, your ability to "turn it off and on again" is perhaps the most powerful weapon you have in your arsenal as a seasoned IT professional. It's important to be realistic however, and, at some point it is I'm afraid, quite likely you'll be required to go beyond the call of duty. Of course you should always try pumping the on/off button of affected hardware hysterically to be absolutely certain the geek magic has transferred but failing that you should ready yourself for tough times ahead. Yes, you may well need to 'Google', to diagnose symptoms and worse still, troubleshoot with your brain. In extreme cases, you should be warned, it's not unheard of that the more demanding customers may ask that you plan to prevent the problem from happening again. Pooled from thousands of IT professionals around the globe, the following software utlities, web services and how-to guides will help you be prepared should the unthinkable strike.

If you use our email server software, MDaemon Messaging Server, and you've ever called our support team with issues relating to being unable to send emails, you may have noticed that we often perform a spam blacklist check. To perform these checks we use just one of a range of useful tools over at the website. We've been using this site for several years as in addition to the blacklist checking you can also do things like query a domain's Mail DNS and SPF records, check whether the SMTP port is answering and even obtain an explanation of message header information. An essential tool to add to your favorites if you are a mail administrator!