Task "your ISP" - Sending' reported error (0x80040201) : 'Unknown Error
0x80040201'

‘’I accidentially triggered a read receipt when I imported some old mail from my previous PC. This caused the error to occur because the address was not in my new PC. ‘’

Download OutlookSpy.

Access to http://www.outlook-tips.net/howto/delete_rr.htm (to delete read receipts) and follow the below outlook tips:

After you install OutlookSpy, the MS Outlook screen will have outlookspy’s menus in the toolbar.

You can browse to any folder of your choice (both visible and invisible in the Outlook UI) by opening the IMsgStore window and then clicking the "Open Root Container" button.

Click Open Root Container.

Then click GetContents Table.

While the regarding row is highlighted, click OpenEntry button.

In the new displayed window, click ImsgStore:AbortSubmit.

Then go back to previous page. From the previous page (GetContents Table), click Delete button to delete the row. Retry the each steps to each row one-by-one.