A terrific article on the Hubspot Inbound Internet Marketing blog provides a checklist of all the things which you should consider before sending out a broadcast email to your prospects and customers. 13 Things to Check Before Hitting ‘Send’ on Your Next Marketing Email covers the obvious and the not-so-obvious, such as having a web-based alternative and checking the plain-text version. It’s worth printing out and going through each time you produce an important email. Remember, it’s very likely that your circulation will be reading your email in a wide range of email applications and on different devices, so do test out what your email will look like in as many combinations as you can. Your email broadcast service may even have a simulation tool such as the one provided by Mailchimp.