http://blogs.msdn.com/jongallant/archive/tags/system.net/default.aspxTags: system.neten-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/jongallant/archive/2007/12/07/system-net-mail-mailmessage-mail-header-casing-issue-fixed-in-net-2-0-sp1-net-3-5.aspxSat, 08 Dec 2007 01:47:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:6697851jongallant8http://blogs.msdn.com/jongallant/comments/6697851.aspxhttp://blogs.msdn.com/jongallant/commentrss.aspx?PostID=6697851http://blogs.msdn.com/jongallant/rsscomments.aspx?PostID=6697851With the transition of MailMessage from System.Web.Mail to System.Net.Mail there were some mail header casing changes that caused mail sent to Hotmail and Live email addresses to appear as being successfully sent, but failed to arrive at the destination...(<a href="http://blogs.msdn.com/jongallant/archive/2007/12/07/system-net-mail-mailmessage-mail-header-casing-issue-fixed-in-net-2-0-sp1-net-3-5.aspx">read more</a>)<img src="http://blogs.msdn.com/aggbug.aspx?PostID=6697851" width="1" height="1">solutionmailmessagesystem.net