Gmail – Setting Up to Send Email Using Outlook Address Fails

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I was trying to set up my Gmail account to send email using my outlook account. However, as I try to set things up using the instruction given here, I always get an authentication error.

This is what I did:

  • On my computer, I opened Gmail.
  • In the top right, I clicked Settings Settings and then See all settings.
  • I clicked the Accounts and import tab.
  • In the Send mail as section, I clicked Add another email address.

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  • I entered my name and the address I want to send from.

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  • I clicked Next Step.

  • Then I filled up the SMTP server (found here) and the username and password on that account.

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  • Then I clicked Add Account.

  • At this point I get the following authentication error.

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I have tried the above steps several times but I always get the same error (leaving aside missed upload deadline error a few times).

This is strange since I can log in to my outlook web account using the same credentials without any error.

However, trying to authenticate from the command line using telnet shows the following error. It may be noted that I have not yet reached the state of providing my credentials.

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I am rather clueless at this moment.

Best Answer

The outlook email address you are using belongs to an organization, so the administrator needs to use the Microsoft 365 Admin center to enable or disable SMTP AUTH on specific mailboxes.
The steps to do this are:

  1. Open the Microsoft 365 Admin Center and go to Users > Active users.
  2. Select the user, and in the flyout that appears, click Mail.
  3. In the Email apps section, click Manage email apps.
  4. Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled.
  5. When you're finished, click Save changes.
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