Doing a scan on multimegabyte attachments would have you writing "Why is Norton email scanning so slow?"
They can't win on this point. Absolute safety means no speed.
-> They scan and block when you open the attachment...
What is the problem with N A V not scanning attachments in email? This seems like a stupid shortcoming. What are you supposed to do with attachments then to safely open them?
(running Norton 2005).
The question often comes up in my mind, are computers, like the saying about recreation boats, "a hole in the water into which you throw money."