DNS Sending mode for my massmail program

I need to implement the DNS sending mode to my program MindSoft PushMail 3 that you can download from [login to view URL] (in Spanish) The product now only can send emails using a SMTP server but I need to implement the DNS sending feature, as you can see in the program GroupMail ([login to view URL] ) ## Deliverables Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. Complete copyrights to all work purchased. ## Platform WinXP ## Deadline information Must be completed in 10 days!