We recently wrote about email being the most used mode of communication on the internet, even ahead of Twitter or Facebook. We generally receive a lot of email and out of that lot, very few are useful ones.
On an Average a manager spends 20 hours reading emails, out of the 200 emails an average employee receives, 36 are SPAM, 144 are irrelevant and only 20 are useful.
Email are sent about every useful or useless topics right from 2 people getting into a relationship to poems and cute baby images, to combat the obscenity here is a guide-flowchart that may help you answer the question whether the email that you are just about to send is worth sending or not.