Support » Plugin: Postman SMTP Mailer/Email Log » Mail goes through but error from Gmail api

  • jbkeefer


    I have your plugin configured on a few sites and have become familiar with the settings. I like the new look by the way.

    I wanted to just let you know this error I am getting. It says there is an authentication error, but i can not find where to enter correct information. I have checked the plugin and the google api console.

    but here it is, perhaps you have seen it. Keep in mind I do get the email. It just comes delivered with a second email with the information below.



    Delivery to the following recipient failed permanently:

    Technical details of permanent failure:
    Google tried to deliver your message, but it was rejected by the relay by [].

    The error that the other server returned was:
    535 Incorrect authentication data
    (SMTP AUTH failed with the remote server)

    —– Original message —–

    X-Received: by with SMTP id j127mr4102697lfd.73.1448065008031;
    Fri, 20 Nov 2015 16:16:48 -0800 (PST)
    Received: from
    named unknown by with HTTPREST; Fri, 20 Nov 2015 19:16:47 -0500
    X-Mailer: Postman SMTP 1.7.2 for WordPress (
    From: TxtDir Admin <>
    MIME-Version: 1.0
    Date: Fri, 20 Nov 2015 19:16:47 -0500
    X-Google-Sender-Auth: pQ4riWe4Uw_wzHCprCHS9eTwVaM
    X-Gmail-Original-Message-ID: <>
    Message-ID: <>
    Subject: Postman SMTP Test (
    Content-Type: multipart/alternative; boundary=001a113fc1da6a6264052501e84d

    Hello! – 你好 – Bonjour! – नमस्ते – ¡Hola! – Olá – Привет! – 今日は
    Sent by Postman 1.7.2

    Image source: – Used with permission

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  • Plugin Author Jason Hendriks


    Is it possible you have Google configured to automatically forward your messages somewhere else? If you received the email properly, then there is nothing wrong with Postman.

Viewing 1 replies (of 1 total)
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