Office 365 – 5.7.3 Authentication unsuccessful

  • Hey – This plugin was working great up until Just before December – now it is giving “5.7.3 Authentication unsuccessful”

    I can still login to Office 365 in the browser. I’ve followed guides and similar threads on here – All settings are correct and the website has not been changed or new plugins installed.

    I just upgraded and when sending a test email am getting:

    Sending the message: Ajax Error

    Any ideas?

Viewing 2 replies - 16 through 17 (of 17 total)

  • Just checked and Azure Enable Security defaults was off by default, still I am getting
    5.7.3 Authentication unsuccessful [AM0PR02CA0102.eurprd02.prod.outlook.com]

    Something people using smtp.office365.com may want to consider is if MFA (Multi-Factor Authentication) is activated on the Microsoft Azure Active Directory server. MFA will likely produce an ‘authentication unsuccessful’ error in a generic environment such as WordPress.

    I came across this Microsoft information regarding a possible solution using:

    APP Passwords or Trusted IPs

    Granted, these solutions will require you to have higher-level server access or access to someone who does. This is not a fix at either the WordPress or Plugin level unless you get that App Password working. In that case, you ought to be able to simply enter the App Password into the plugin settings as you normally would enter your account password.

    I am getting the 5.7.3 Authentication Unsuccessful error in my setup, and we recently implemented MFA. I have not tried either of these solutions yet, but I will be trying them. Others might want to try these solutions if MFA is a factor.

Viewing 2 replies - 16 through 17 (of 17 total)
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