Move all of the *.CNM files out of the new mail directory and try again. It should now open normally. You can then put the messages back one at a time until you find the problem message.
It's probaby going to be a really large message. If you are using content control then I'd recommend that you set a limit on the message size so you are not scanning these large files with encoded attachments.
1. Use Tools | Spam and content controls | Content control...
2. Select and edit the control definition
3. Select the "Message tests" tab.
4. Enter 8000 in "Check at most this many bytes in each message"
<p>Move all of the *.CNM files out of the new mail directory and try again.&nbsp; It should now open normally.&nbsp; You can then put the messages back one at a time until you find the problem message. &nbsp;
It's probaby going to be a really large message.&nbsp; If you are using content control then I'd recommend that you set a limit on the message size so you are not scanning these large files with encoded attachments.
1.&nbsp;&nbsp;&nbsp; Use&nbsp; Tools | Spam and content controls | Content control...
2.&nbsp;&nbsp;&nbsp; Select and edit the control definition
3.&nbsp;&nbsp;&nbsp; Select the "Message tests" tab.
4.&nbsp;&nbsp;&nbsp; Enter 8000 in "Check at most this many bytes in each message"
</p><p>&nbsp;</p>
