I have a video email software package. I allow my clients to login and send out video emails. However, when I sent out the email I bounce it of our server but I spoof it with their email addres. When the video is received it will go back to the user's primary address. For example, if their email address is email@example.com then when the email show up in the recipients inbox it will show that it is coming from firstname.lastname@example.org. Obviously that is not really the case. I need to be able to allow my customers to legitimately send out emails through my mailserver. We are having difficulty with yahoo and hotmail specifically. This is very urgent. I have a lot of unhappy customers. Any Ideas?