I have been using Windows Live Mail 2012 for a few years with few issues. The past few days, I have been unable to send outgoing messages; however, my incoming messages still successfully arrive in my inbox. My password has not changed, but each time I access Live Mail, the logon window pops up. When I close Live Mail, I receive a message that my messages were not successfully sent. I have even uninstalled and re-installed Live Mail, but the problem persists. Please advise.