Norton Anti=Spam preventing send e-mail in Outlook 2013

Just set up a new computer, Dell 8700.  I am using NIS -21.1.0.18.  Windows 8.1 64 bit and Outlook 2013.  When I try to send an e-mail it goes into the Outbox but does not get sent.   Mail in Outbox loses italic format.  If I go into my Outbox, open mail, and then send it, the e-mail is successfully sent.

 

If I disable the Norton anti-spam Outlook add-in, the problem described above does not occur, i.e.,  mail in outbox does not lose italic format and it is sent immediately.  Is this a known problem (I've seen reference to similar issues) ....with a solution?  

 

Thanks.