I will suggest you to use email marketing service, because you do not need to be worried about any thing, you don't need to create email or they have techniques about modern email marketing. Email marketing software will only help to create email.
As a computer repair person, I know it's only a matter of time for your computer to crash with your software and contacts in it. I'm a big fan of working online. Caution is advised to make sure your email service allows you to export your email list in case you switch email services. Last time I checked Aweber did not allow this.