WIth Eset Nod32 scanning outgoing emails, I have the problem, that Outlook 2013 is not able to answer or to forward some specific emails. I have no idea, what is the issue about these emails. But if I try to answer or to forward one of the affected emails, it stucks in th outbox and outlook gives me an error message "Sending reported error (0x800CCC13): 'Cannot connect to the network. Verify your network connection or modem'"
When I disable scanning outgoing emails within Nod32, then Outlook is able to send these emails.
I had this problem with Nod32 7.0.3xx allready. After updating to 8.