← Back to the Training Hub
Staying safe

Lookalike email addresses: check the part after the @

Scammers register addresses one letter away from the real thing. Here's where to look.

Scammers often register web addresses that look almost exactly like a real company's, then send email from them. At a glance, the email looks like it's from someone you deal with every day.

Common tricks

  • One letter swapped or added: deepnnet.com, or rn in place of m (rnicrosoft.com)
  • A different ending: .co or .net in place of .com
  • Extra words: microsoft-support.com, or yourcompany-invoices.com
  • A real company name in the wrong place: microsoft.com.secure-login.net. The real domain is the last part, just before any slash: here, secure-login.net.
  • A familiar display name with an unrelated address behind it

How to check

  1. Look at the full address, not just the name. In Outlook, select the sender's name to see it.
  2. Read the part after the @ slowly, letter by letter, especially for anything about money, passwords or files.
  3. Hover over links before clicking to see where they really go.

Spot a lookalike? Report it in Outlook using Report > Report phishing, and let us know if it's pretending to be someone you work with.

More detail

Microsoft: Phishing and suspicious behavior in OutlookCISA: Recognize and report phishing
Last checked against these sources:
November 11, 2026

Want the step-by-step guide?

Still stuck? We're here to help

support@deepnet.com · 707-755-8000 · 6am to 6pm Pacific, Monday to Friday, with 24/7 emergency cover

Raise a ticket