Firstly,opt in email marketing for your campaign is that it is a sure shot list of email ids that have subscribed to your newsletters and are those people who have either visited your website once and are interested in knowing what is going on in your site so that they can make use of your site products when they are in need of it.
Secondly,email marketing software are flexible, efficient and speedy and now days are spam compliant too.One can easily send bulk mails to existing as well the potential customers.
Thirdly,Building brand awareness of your latest happenings, schemes, events, prices and almost anything about your business.
Fourthly,Deploy an effective email marketing software to make subscription with half the work with double results,to target special audience.
Fifth,good email marketing software programs have an important feature of generating reports according to your requirements. It can lighten your workload and analysis process.
Nowadays,there are hundreds of companies over the internet who offers different types of internet email marketing campaign(http://www.phpnewsletter.org/features.html) but finding the right one is often a difficult job.