Suddenly unable to send large emails from C# application

Hi can anyone help?
I have started to receive :
System.IndexOutOfRangeException: Index was outside the bounds of the array.
at System.Net.Base64Stream.EncodeBytes(Byte[] buffer, Int32 offset, Int32 count, Boolean dontDeferFinalBytes, Boolean shouldAppendSpaceToCRLF)
   at System.Net.Base64Stream.Write(Byte[] buffer, Int32 offset, Int32 count)
   at System.Net.Mime.MimePart.Send(BaseWriter writer)
   at System.Net.Mime.MimeMultiPart.Send(BaseWriter writer)
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
When a large email is sent from a C#app on .NET4
I read that there is a hotfix for this issue, but I can't see to find it - all I get from MS Connect site is Page Not Found, can anyone help?

Hi john,
Thank you for posting in MSND forum.
Since
this forum is to discuss: Visual
Studio WPF/SL Designer, Visual Studio Guidance Automation Toolkit, Developer Documentation and Help System, and Visual Studio Editor.
Based on your issue, it is related to the C# application,
so
I’m afraid that it is not the correct forum
for this issue.
To help you find the correct forum support this issue,
could you please tell me which kind of application you create using C# language? Is it a c# console application or others?
If possible, I suggest you could share the detailed coded about your issue so that we will better support this issue.
Thanks for your understanding.
Best Regards,
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
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