To open email attachments safely, it is important to never open unexpected or suspicious attachments, as they may contain malware, adware, spyware, or viruses that can damage or steal data.
It is also important to be aware of the risks of opening attachments from untrusted senders, as this is one of the easiest ways to get hacked.
If in doubt, it is best to call the sender to verify the attachment before opening it.
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Opening email attachments from untrusted senders has long been one of the easiest ways to get hacked. But unlike other common security screwups—using "password" for your password, downloading pirated software from shady websites—there's no practical way for a modern human to avoid opening the occasional mystery-meat attachment.
Dangerzone Lets You Open Email Attachments Safely | WIRED