An unknown error has occurred.

Server: 'mail.twc.com'
Windows Live Mail Error ID: 0x8007007A
Protocol: SMTP
Port: 587
Secure(SSL): No

seems to be with pictures as when tried to send 2 on a form multiple times. I did not see in my sent folder.  Other emails went through.   Whenever I open my email I see this

how to get rid of this?