I am using Outlook 2003 SP3 and just installed Norton Internet Security 2010 ver 17.7.0.12. Since installing I can send and receive e-mails but cannot reply. When I create a new e-mail it is placed in my outbox and is sent without problem. When I hit reply to (or forward) an existing e-mail, the e-mail remains in my outbox indefinitely.
Any ideas?