SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/sec-recognized-source-attachment

Microsoft Learn says not to open attachments or links in unsolicited emails, even if they came from whom?

A recognized source.

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  1. A recognized source ✔
  2. Only an unknown stranger
  3. A mailing list you left

Why: Attackers fake a name you know or take over your coworker's account. If you didn't expect it, ask the sender through a different channel.

Huh, didn't know that: Microsoft says to treat an email as suspect if it suddenly comes from a person or company you rarely deal with.

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References

Answer: A recognized source. Attackers fake a name you know or take over your coworker's account. If you didn't expect it, ask the sender through a different channel.

  1. Microsoft Learn: Phishing learn.microsoft.com/defender-endpoint/malware/phishing
    Don't open attachments or links in unsolicited emails, even if the emails came from a recognized source.
    Checked 2026-10-10.

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Test yourself in the game

Security & PrivacyThere's a QR code sticker on the parking meter. What's the smart move before you pay?Security & PrivacyA website shows a padlock and https. What does that tell you?Security & PrivacyA phishing email lands in your inbox. The FTC says to forward it to which group?

That's stuff everyone should know.