The bug has been patched: https://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=30226
Title: KB2183292
Release Date: 7/21/2010
Size: 8.58 MB
Version: Hotfix
Category: Build
Description QFE: System.Net.Mail - SmtpClient class throws exceptions if file attachment is > over 3MB
