When you really need E-mail delivered – Signing your mail using Domain Keys/DKIM

So you’ve started sending email from your site/application, your application is doing well and you are now sending more e-mail daily. With this comes the fun of finding out that most of the email you now send ends up stuck in your customers spam filters – how did this happen? You aren’t a Nigerian scammer, and people opted-in to hear from you! At this point signing your mail may be the next step.