Support » Plugin: Post SMTP Mailer/Email Log » 5.7.139 Authentication unsuccessful error suddenly

  • Resolved redkite

    (@redkite)


    My client just started getting this error when people submit any of her forms, we’ve been using PostSMTP successfully for a few years.

    5.7.139 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Tenant. Visit aka.ms/smtp_auth_disabled for more info. [CH2PR19CA0023.namprd19.prod.outlook.com]

    Here is the connection test – not sure what I need to do?

    Transport Socket Status* Service Available Server ID Authentication
    None Login Plain CRAM-MD5 OAuth 2.0
    SMTP smtp.office365.com:25 Open πŸ”’ SMTP-STARTTLS office365.com No Yes No No Yes
    SMTP smtp.office365.com:465 Open No – – – – – –
    SMTP smtp.office365.com:587 Open πŸ”’ SMTP-STARTTLS office365.com No Yes No No Yes
    Mandrill API mandrillapp.com:443 Open πŸ”’ HTTPS mandrillapp.com n/a
    SendGrid API api.sendgrid.com:443 Open πŸ”’ HTTPS sendgrid.com n/a
    Mailgun API api.mailgun.net:443 Open πŸ”’ HTTPS mailgun.net n/a
    * According to portquiz.net

    Summary:
    βœ… πŸ”’ Port 25 can be used for SMTP to smtp.office365.com.
    βœ… πŸ”’ Port 587 can be used for SMTP to smtp.office365.com.
    βœ… πŸ”’ Port 443 can be used with the Mailgun API.
    βœ… πŸ”’ Port 443 can be used with the Mandrill API.
    βœ… πŸ”’ Port 443 can be used with the SendGrid API.
    ❌ Port 465 is open, but not to smtp.office365.com.

Viewing 10 replies - 1 through 10 (of 10 total)
  • Plugin Author yehudah

    (@yehudah)

    Someone disabled SMTP for the box you have a link with an explanation in the error you posted.

    One way to try:

    Use the Microsoft 365 admin center to enable or disable SMTP AUTH on specific mailboxes
    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.
    Thread Starter redkite

    (@redkite)

    Thanks, I’ll get my client to do this and report back.

    Plugin Support Tim

    (@tneville)

    Hi @redkite,

    You could also use the Office 365 API as an alternative, but what @yehudah suggested should work fine!

    Kind Regards,
    Tim

    Thread Starter redkite

    (@redkite)

    Thanks, my client’s getting her IT guys to look into this.

    Plugin Support Tim

    (@tneville)

    Sounds good, @redkite! Let us know if you need anything else.

    Please also let us know if you are happy for this to be considered resolved.

    Kind Regards,
    Tim

    Plugin Support Tim

    (@tneville)

    Hi @redkite,

    We haven’t heard from you in a while, so I’ll mark this thread as resolved. If you have any further questions please feel free to open a new thread, and link to this one.

    Kind Regards,
    Tim

    I have same the issue, however i don’t see “Authenticated SMTP setting” at all, see screenshot?

    https://prnt.sc/12gbr3a

    How can I disable SMTP Auth?

    Plugin Support Tim

    (@tneville)

    Hi @onastvar,

    Please start a new thread and link back to this one. It becomes confusing if you are replying to a resolved thread about a different issue.

    Please also confirm where you took this screenshot from – it looks quite different to the Office 365 admin centre.

    Kind Regards,
    Tim

    Thanks Tim! I have opened up new thread here.

    Thanks @tneville! I contacted GoDaddy email support and they had their Admin enable SMTP on my account, I was told to wait 2 hours before trying again. I appreciate your help!

Viewing 10 replies - 1 through 10 (of 10 total)
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