DarkMailer

There is a way to do what you want for sure, I havent had the program in 5 years so i forgot exactly, if you can please help me out with a copy I will take the time to answer your question once i look into the program again.

thanks!

The only good cracked copies that contain no trojan/backdoor is dm 1.38 with the date, timestamp. and FastMailer edited dm which allows you to run multiple instances of the program. I haven't used it in years but it's a fast socks proxy mailer with customisable headers.