Preview disable for protection. And so, good Netiquette to close the email preview pane. Hence, don’t allow html previews.
Unknown attachment risk. It is good Netiquette to confirm the contents. Do not open unknown.
Scan all directories to be safe. Hence, good Netiquette to scan all directories when looking for viruses. Also, don’t do quick scans. So, do scan everything.
Software protection for online. Thus, good Netiquette to use multiple antivirus software programs. And so, do use firewalls. Also, scanners. Plus, pop-up blockers.
Software research protection. Then, good Netiquette to research before installation. So, don’t install software without checking it out first.