System.Net.Mail.SmtpException: 'The SMTP server requires a secure connection or The server response was: #5.7.0 Must issue a STARTTLS command first'

Question

What could be the solution for this error.

System.Net.Mail.SmtpException: 'The SMTP server requires a secure connection or The server response was: #5.7.0 Must issue a STARTTLS command first'

using (var smtpclient = new CvxSmtpClient("username", "password", 587))

                        message.Body = email.message;
                        smtpclient.EnableSsl = false;
                        smtpclient.Send(message);                           
                        var param = new SqlParameter();
                        param.ParameterName = "@id";
                        param.Value = email.id;
                        db.ExecuteSql(queryUpdateEmailsToSend, param);

Please update the code provided sample since it's syntactically incorrect. — Michael Schnerring, Sep 17 '20 at 11:00
Possible duplicatte(s): https://stackoverflow.com/questions/44869628/error-in-sending-mail-with-c-sharp — y_ug, Sep 17 '20 at 11:01

score 0 · Answer 1 · answered Sep 17 '20 at 10:59

0

The SMTP server refuses insecure connections.

You set smtpclient.EnableSsl = false, so the SmtpClient doesn't use SSL. Try setting it to true.

For more details have a look at the docs: SmtpClient.EnableSsl Property

answered Sep 17 '20 at 10:59

Michael Schnerring

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Even after setting smtpclient.EnableSsl = true. I'm getting this error "system" at system.net.mail.mailcommand.checkResponse(SmtpStatusCode StatusCode, String response)\r\n at system.net.mail.mailcommand.Send(SmtpConnection conn, – Reshimma Pasupathi Sep 17 '20 at 15:07
@ReshimmaPasupathi add the new error to your question since it doesn't seem to fit a comment and fix the issues with your initial question while you're on it. Also, please format your content properly. Read [Markdown help](https://stackoverflow.com/editing-help). – Michael Schnerring Sep 17 '20 at 15:21

System.Net.Mail.SmtpException: 'The SMTP server requires a secure connection or The server response was: #5.7.0 Must issue a STARTTLS command first'

1 Answers1