I posted about this issue a little while ago and people were very helpful. But I need to repopen the thread because I have another problem. see this post
I tried it using my account to send as another email address and it works because I'm an enterprise admin. But when I use a different account that isn't an enterprise admin it doesn't work even when I grant them full control of the disto group in ADUC. I've even tried removing my user account from the enterprise admin group and it stops working for me.
I don't want to give they guy who sends out or email blasts enterprise admin rights.