Unless your PC has malware contamination you have no need to scan outgoing mail - you must scan incoming as you have no idea what is being sent to you.
Norton, although good, is well known for being a bit of a hog when it comes to resources.
Galaxy Note 8 vs iPhone X
Awful clip art from 1994 is being tweeted every hour by a bot
iPhone X vs Samsung Galaxy Note 8
Les meilleurs navigateurs internet 2017