Office 365 SMTP authentication failing, even with correct account information

I bought an email with Godaddy last night, using Office 365, so that I could use it for SMTP on my Wordpress site.  Same problem as these others -- the SMTP will not authenticate:  

SMTP ERROR: Password command failed: 535 5.7.3 Authentication unsuccessful [MN2PR04CA0007.namprd04.prod.outlook.com]

I even changed passwords, to no avail.  Nothings works.  I think I need a refund.

Turn off the microsoft's security defaults here and this will help: https://portal.azure.com/#blade/Microsoft_AAD_IAM/ActiveDirectoryMenuBlade/Properties

More info: https://docs.microsoft.com/en-us/azure/active-directory/fundamentals/concept-fundamentals-security-defaults

I don't believe that i post solution thatch work onmicrosoft.com only accept solution should be slc /scannowYou have to enable Authenticated SMTP then wait 3 minutes.Open the Microsoft 365 admin center and go to Users > Active users.

Select the user, and in the flyout that appears, click Mail.

In the Email apps section, click Manage email apps.

Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled.

When you're finished, click Save changes.

This solve my problem..

When my admin entered the screen, this option was already checked in my account, so he deselected, saved, closed the screen (I don't know if it is necessary), entered again, selected again and saved.

I waited 5 minutes, and updated the configuration in gmail.

And work

Hi all,

As mentioned above, the SMTP AUTH protocol is now disabled by default for new organisations onboarding to Microsoft 365/Office 365/Exchange Online. This was announced here: 

https://techcommunity.microsoft.com/t5/exchange-team-blog/securing-authenticated-smtp-in-exchange-online/ba-p/1293154

The change uses two settings, an organisation setting (SmtpClientAuthenticationDisabled) , and per-mailbox settings (Under Manage Email Apps or the ) to allow admins to finetune what mailboxes have this protocol enabled. with the per-mailbox settings overriding the organsation setting such that you only need to enable mailboxes that need to use the protocol and allow the others to remain secured and disabled. 

You can learn who to change these in the document shared above: 

https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission 

For reference, the main support document that offers advice on how to configure devices and clients like Wordpress sites to send emails can be found here: 

https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365

We added a note warning about SMTP AUTH being disabled to it as part of this change in behaviour. 

Regarding basic authentication, just to be clear, this is a protocol-based setting and it disables SMTP AUTH, regardless of whether basic auth or OAuth is being used.

Hello Adam,

Given this situation, I consider you may login Outlook Web App with impacted account to see if emails can be sent.

If Outlook Web App works well, then check firewall settings, anti-virus or related apps on your server and network, make sure all Office 365 related traffics are allowed: Office 365 URLs and IP address ranges, for some SMTP relay issues are caused by network settings.

You may also refer to this article for troubleshooting: Fix issues with SMTP client submission.

Besides, is there any organization-wide changes made recently? If convenient, use a different Office 365 account to see how it goes.

Best Regards,

Anna