Once upon a time you could trust any email sent from people you knew. Now you should eye each one suspiciously. If you have an email conversation thread going with a friend, usually those are ok to open, click on the links they send and continue the conversation. However if you recieve and email out of the blue from somebody you know, wanting you to click on a link, open this file especially trying to sell you goods or services that you know that person doesn't ordinarily do, delete and give the person a call, text or use other means of communication to let them know about the email. Hopefully then they can look at their email, see if anything out of the ordinary is in the sent box, if so change the password immediately. If not, proceed with caution, scan the pc for spyware/viruses and hopefully they were just 'spoofing' their email address, and not have anything running on their pc.
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In-context editing is pretty cool cool!