Hi, Just to add an update to my problem.
I moved away from specifying a SourceFilename, and instead used the SourceStream property as below:
FileStream fs = new FileStream(_fileFullName, FileMode.Open);
msgPart1.SourceStream = fs;
This now uploads perfectly to your server, I can see the message in my "Sent" items mailbox and the image is correct.
Does this mean there is a bug in the SourceFilename property?
Furthermore, I am still not receiving the Image correctly onto my phone (HTC HD2) as I am getting the message
"Unable to download message from xxxxxxxxxx"
So, to conclude, I have successfully uploaded the graphic to your server correctly. I can now verify this in my "Sent" items mailbox.
I still cannot download the graphic from your server onto my phone.
Regards
Andy