Question

Which routine best ensures email safety?
Do not open emails from unknown senders.
Open all emails from known senders.
Open attachments from known and unknown senders after they are scanned for viruses.
Open emails from unknown senders after they are scanned for viruses.
Open all emails from known senders.
Open attachments from known and unknown senders based on your instinct.
Open emails from unknown senders after they are scanned for viruses.
Open emails from known senders after they are scanned for viruses.
Open attachments from known senders after they are scanned for viruses