You can enhance and improve your email marketing with email marketing software. But you need to take care of few things before you buy a email marketing software.

The email marketing software you use should allow you to add maximum number of fields that helps in making it more of personalized. This would reduce the chances of getting your mail dumped in trash. The email software you use should be able to put the right data in right fields. It should put the email address of recipient in to field and even the name.

It should automatically update the subscribed and unsubscribed list. Some software can even   efficiently  capture and store contact information's from website logs. The software you go for should be able to even extract the email address stored on your systems in any file and add to the existing list.

Email marketing software should be able to automatically process the web forms.
Before making a purchase, make sure you have done a good analysis and compared different products.