Massive mail software, feedback needed

Hello I had tried a few massive email app without good success, I decided to make my own massive email software, but I want to get some feedback here to sell it after it is done.

Here are my questions/doubts

1. What will.be better, a saas or an windows app?
2. How about proxies, the app can have some free proxies or let the user choose/use his own

Any other spec that can add value to the app will be useful, I wilmake the app, then I will buy the VIP membership and will sell the software here at bwh.

Thanks in advance for all the help.

1. web based program is allways better, for these reasons:

• users don't need to download new versions, it's allways there on your website.
• it's way harder to crack if it's web based (windows apps cracking is easier, especially if you are using .net)

2. you can add a simple proxy finder, that works with free proxy sites and also let users add their own proxies.