1. IF ERROR 503 This mail server requires authentication. Please check your mail client settings.
In OE go to Tools > Accounts > Properties > Servers tab and tick the box 'My server requires authentication'
2. Repair OE with system file checker
in the run box, press enter and let system file checker find and replace missing / corrupt file in windows, explorer, IE and outlook / outlook express.
This will take awhile to complete and you may be asked for the CD to be in the drive if windows is not preinstalled on the hard drive.
3. Possible reasons for no outgoing email
smtp settings incorrect
antivirus email scanner blocking / delteing mail