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How to Fix Outlook.com and the Gmail Phishing Warning “This message may not have been sent by:”

At some point in my life, I associated my Gmail email address with my Microsoft Live account, so when Outlook.com rolled out, my Gmail email address was my login alias. I was surprised to see that Outlook.com let me send emails using my @gmail.com address, even though I hadn’t set it up.

sending gmail from outlook phishing warning

I was even more surprised to see that they went through. However, there was a catch. It showed up in the inbox with a dire warning message:

This message may not have been sent by: [email protected] Learn more Report phishing

This message may not have ben sent by report phishing

The problem, according to Google, was that the email said that it was coming from @gmail.com, when in reality, it was Outlook.com’s mail server that originated the message. This is a common trick by phishers, who pretend to be sending out official requests for information or login links from spoofed email addresses.

outlook.com spoofing email address

If you’ve also logged in to Outlook.com for the first time using an unrelated email address, you may also be able to send sketchy looking emails. Fortunately, there’s an easy fix for that false negative phishing alert:

Note that if you are using Gmail, you might get a message in Outlook.com telling you: “Check your email address and password, but the problem may be that you need to go to Gmail’s settings page and enable “POP Download”.” To fix this, log in to your Gmail account and look for this warning at the top: “Warning: Google prevented a suspicious attempt to sign in to your account. Was it you?” Click Was it you? and follow the steps for allowing hotmail.com (or Outlook.com) access to your Gmail account.

warning: google prevented a suspicious attempt to sign in to your acount was it you?

gmail suspicious activity in your account

That should clear up all your shady looking error messages in Gmail. Leave a comment below if you need more help!

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3 Responses to How to Fix Outlook.com and the Gmail Phishing Warning “This message may not have been sent by:”

  1. jim May 15, 2013 at 8:09 am #

    my e mail is right somebody must be on my e mail i dont know whos doing this can you cheek the ones that are doing this thank you jim fazio

  2. kay krause May 21, 2013 at 4:50 pm #

    Steve i do not understand the fix, but have received a few messages as per example
    “This message may not have been sent by:.”
    Can you fix thank you
    Thank you to Steve or Austin Krause

  3. Samia May 23, 2013 at 10:33 am #

    Jack, which software you use to capture screenshots?

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