Sent an email that I conclude had an error in the address line (sent to many addressees); but after Server error 501 and Windows live mail error 0x800CCC79 I cannot (a) get the email back to delete or modify it, and (b) cannot send any other emails. ARGGH.

I cannot find any way of getting into the outbox where this failed-to-be sent email is apparently still lodged. I am using Windows 10 and Livemail Version 2012 (Build 16.4.3528.0331)

Only tip I have found in my searches is to uninstall and then reinstall Windows Live Mail.  

Ideas?