It is best to be cautious before opening any unknown email attachments. While many unknown attachment emails are harmless, some may contain malicious intent to spread malware, ransomware or virus. It is best to not open any attachments from senders you don’t recognize or don’t trust.

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1. Do not open attachments from suspicious or unrecognized sources.
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2. If the attachment is from an acquaintance or someone you may know but don’t remember sending it, contact them through other means to verify that they did actually send it.
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3. Remember that you can get malware or ransomware even from people you know, so always be cautious.
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4. When in doubt, it is safest to delete the email.