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  • How to resolve the error "The server response was: 5.5.1 Authentication Required"

    @mona.jain
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    Sometime the email is sending on local machine but not on the server machine it gives the error "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required" To resolve these we add the 2 lines extra for sending email using gmail 1.smtpClient.UseDefaultCredentials = false;
    2.smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network

    Here below is the complete code for sending email using gmail

    1. public static bool SendEmail(string emailAddress, string bodyMessage, string Subject)
    2.   {
    3. smtpClient = new SmtpClient();
    4. smtpClient.Host = "smtp.gmail.com";
    5. smtpClient.Port = 587;    
    6. message = new MailMessage();
    7. message.IsBodyHtml = true;
    8. smtpClient.UseDefaultCredentials = false;
    9. smtpClient.Credentials = new NetworkCredential("Username", "pwd");
    10. smtpClient.EnableSsl = true;
    11. message.From = new MailAddress("emailfromaddress", "emailheader");
    12. message.Body = bodyMessage;
    13. message.Subject = Subject;
    14. message.To.Add(emailAddress);
    15. smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
    16. smtpClient.Send(message);
    17. }
    SendEmail
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