Why do the e-mail messages sent from Outlook Express arrive truncated and are missing data?

When you send a message using Microsoft Outlook Express, the recipient may report that the body text of the message is truncated and may be missing data. This problem may occur if the e-mail message contains non-ASCII characters, such as Chinese characters.

This problem has nothing to do with the SMTP service. The SMTP Server either delivers the complete message or does not deliver it at all (if the destination POP3 server is down). This is a documented Microsoft's Outlook Express bug, and you can fix it by applying the Cumulative Update for Outlook Express 6 Service Pack 1 (KB887797) or the Cumulative Update for Outlook Express for Windows XP Service Pack 2 (KB887797) .