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Editorial Team
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Asked: 2026-05-18T01:35:59+00:00

I’m trying to send email via google apps from my asp.net app and am

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I’m trying to send email via google apps from my asp.net app and am getting the following exception:

{“The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at “}

My Web.config has the following values (sorry I couldn’t get the XML to display): 

<system.net>
    <mailSettings>
        <smtp from="user@domain.com"
              deliveryMethod="Network">
            <network host="smtp.gmail.com"
                     port="587"
                     userName="user@domain.com"
                     password="password"
                     enableSsl="true"/>
        </smtp>
    </mailSettings>
</system.net>

I’m thinking that this is due to my not having an SSL cert but I’m not sure. Any thoughts?

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1 Answer

  1. Editorial Team

    I have it working this way with one of our gmail account (code is simplified):

     SmtpClient client = new SmtpClient("smtp.gmail.com", "smtp.gmail.com");
 client.EnableSsl = true;
 client.Credentials = new NetworkCredential(userName, userPassword);
 client.Send(mail); // mail is of type System.Net.Mail.MailMessage

    You could try to send an email with this code and your configuration just to see if you receive the same error message.

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