5.7.139 Authentication unsuccessful error suddenly

  • Resolved redkite

    (@redkite)


    3 years, 9 months ago

    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 ?? SMTP-STARTTLS office365.com No Yes No No Yes
    SMTP smtp.office365.com:465 Open No – – – – – –
    SMTP smtp.office365.com:587 Open ?? SMTP-STARTTLS office365.com No Yes No No Yes
    Mandrill API mandrillapp.com:443 Open ?? HTTPS mandrillapp.com n/a
    SendGrid API api.sendgrid.com:443 Open ?? HTTPS sendgrid.com n/a
    Mailgun API api.mailgun.net:443 Open ?? HTTPS mailgun.net n/a
    * According to portquiz.net

    Summary:
    ? ?? Port 25 can be used for SMTP to smtp.office365.com.
    ? ?? Port 587 can be used for SMTP to smtp.office365.com.
    ? ?? Port 443 can be used with the Mailgun API.
    ? ?? Port 443 can be used with the Mandrill API.
    ? ?? 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)

  • 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.

    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.

    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

    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?

    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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