Zhenya wrote:

Sometimes Outlook will send but not receive. Then it will receive but not
send. At present it has become stuck in forwarding an attached 3MB file. I
cant't stop it and it won't complete the transmission. What to do?

Delete an item stuck in the Outbox folder:
- Load Outlook.
- Put Outlook in offline mode (File - Work Offline: enable).
- Exit Outlook.
- Load Outlook in its safe mode ("outlook.exe /safe").
- Delete the stuck item in the Outbox folder. If you don't want the
item to move into the Deleted Items folder, use Shift+Del to
permanently delete the item.
- Put Outlook in online mode (File - Work Offline: disable).
- Restart Outlook in its normal mode.