![]() On the Active user's page, choose Multi-Factor Authentication. ![]() In the Microsoft 365 admin center, in the left navigation menu, choose Users > Active users. Verify that the Authenticated SMTP setting is checked (enabled).ĭisable Multi-Factor Authentication (MFA) on the licensed mailbox being used: ![]() In the Email apps section, select Manage email apps. If you are getting one of the following errors:ĥ.7.57 Client not authenticated to send mailĮnable Client SMTP submission on the licensed mailbox being used:įrom Microsoft 365 Admin Center, go to Active Users and select the user. In my case, I followed the following 3 steps and it worked. Smtp.Send(fromAddress, toAddress, subject, body) Smtp.Credentials = new NetworkCredential(fromAddress, fromPassword) Tc = new Ticket_MailTableAdapters.tbl_TicketTableAdapter() ĭt = tc.GetEmail(dpl_cate.SelectedValue) Ticket_MailTableAdapters.tbl_TicketTableAdapter tc Thank you.Ĭode: protected void btnsubmit_Click(object sender, EventArgs e) ![]() The server response was:ĥ.7.57 SMTP Client was not authenticated to send anonymous mail during MAIL FROM. Given the below code showing The SMTP server requires a secure connection or the client was not authenticated. I have to send mails using my web application. ![]()
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