send email using O365 from development computer RSS

• • Reply
  winseealn@ho...

  Member

  297 Points

  1356 Posts

  send email using O365 from development computer

  Mar 31, 2020 02:56 PM|winseealn@hotmail.com|LINK

  hello all,

  using https://weblogs.asp.net/sreejukg/send-email-using-office-365-account-and-c website, i tried to send email using C#, office 365 from my development laptop but, i have received exception as "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM [MRXP264CA0011.FRAP264.PROD.OUTLOOK.COM]"

  actually i do have account in office365, may i know the reason and how to resolve this error?

  below is my sample code

   public void SendEmailFromOffice365()
          {
              try
              {
                  String userName = "MyId@myDomain.com";
                  String password = "MyPWD";
                  System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
                  msg.To.Add(new MailAddress("MyId@myDomain.com"));
                  msg.From = new MailAddress(userName);
                  msg.Subject = "Test Office 365 Account";
                  msg.Body = "Testing email using Office 365 account.";
                  msg.IsBodyHtml = true;
                  SmtpClient client = new SmtpClient();
                  client.Host = "smtp.office365.com";
                  client.Credentials = new System.Net.NetworkCredential(userName, password);
                  client.Port = 587;
                  client.EnableSsl = true;
                  client.Send(msg);
              }
              catch (Exception ex)
              {
                  throw ex;
              }
          }

• • Reply
  samwu

  Contributor

  3370 Points

  1409 Posts

  Re: send email using O365 from development computer

  Apr 01, 2020 06:06 AM|samwu|LINK

  Hi winseealn,

  winseealn@hotmail.com

  The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM

  winseealn@hotmail.com

  String userName = "MyId@myDomain.com";
                  String password = "MyPWD";

  I tested your code, it works fine in my site.

  Usually this error is due to incorrect account and password, so please check your account and password.

  Best regards,

  Sam

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