This event can occur when a message sent from Microsoft Mail to Exchange through the Microsoft Mail Connector interchange (MSMI) using a Russian Outlook client fails to be delivered to its destination. Microsoft suggests to obtain the latest service pack for Exchange Server version 5.5. See ME186672
for more details.
If you have an Outlook 8.0x or Outlook 8.5 client running on Windows NT 4.0 Workstation or Windows 95/98 with language settings set to an East European language, see ME224987
for a hotfix applicable to Microsoft Exchange Server 5.0.
Event ID 270 and Event ID 290 may be logged in the application event log of the server, if a public folder has an SMTP e-mail address, and a user who does not have rights to post to that folder sends an e-mail message to that SMTP e-mail address. See ME251016
for more information about this problem.
Mail that is sent with attachments may be sent back to the sender, and a non-delivery report (NDR) may be generated. In some cases, the recipients still receive the mail. See ME288848
if these are the symptoms that you experience.
If no Exchange 2000 Server computers in the Routing or Admin group have a public folder store for the Messaging Application Programming Interface (MAPI) Public Folder tree and no Exchange Server 5.5 computers in the Routing or Admin group have replicas of the folder being e-mailed, this event will occur. See ME302394
for a resolution.
provides information about this event.