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.
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Synology invite you to their launch event on 16th September 2015. See the unveiling of the new DSM and products live, plus a chance to win a populated NAS! Tickets are free and available now. Click HERE for more details