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https://stackoverflow.com/questions/38760055/server-does-not-support-secure-connections-in-c-sharp
@Abhishek Yes.The code that you have written will send the message to the server just check your mail box (***@gmail.com) but smtp client of google is preventing you from entering into thier domain. You have to make your gmail less secure that is you need to allow sign in attempt.
https://stackoverflow.com/a/16239293
Your server does not support SSL on the default port; Most won't. When you set SSL off, you get the message, "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated" That tells you that you are not authenticated.
https://social.msdn.microsoft.com/Forums/vstudio/en-US/01d437d9-4815-4fba-8201-070dc0eed903/handling-quotserver-does-not-support-secure-connectionsquot-using-an-smtpexceptionstatuscode
Nov 13, 2014 · Handling "Server does not support secure connections" using an SmtpException.StatusCode? ... { client.Send(oMail); } catch (System.Net.Mail.SmtpException e) { //If the server does not support TLS, try again without it. ... I like this answer because it avoids another delay while the SMTP server is contacted. At least if the SmtpException ...
https://social.msdn.microsoft.com/forums/en-US/bc2f9709-c1c2-42ce-959e-471d3b52e1dc/getting-error-server-does-not-support-secure-connections-using-systemnetmailsmtpclient
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https://forums.asp.net/t/1091403.aspx?+Server+does+not+support+secure+connections+error+with+SMTP+mail+and+SSL
Mar 26, 2007 · Reason for the question is that I'm not quite sure how IIS does with the SMTP-server that's builtin when you install a server certificate for the Web server. Check the properties of the virtual SMTP-server if that's the one you're using.
http://www.nullskull.com/q/10333090/server-does-not-support-secure-connectionc-windows-form.aspx
server does not support secure connection..c# windows form hi,i have this form; what it does is send an email (just like normal email system)... I'll cover the ...
https://answers.microsoft.com/en-us/msoffice/forum/all/smtp-server-requires-a-secure-connection-or-the/7e3ff1c8-c821-499f-9205-a315ae5832a5
Mar 27, 2016 · 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 Please help how i can resolve this
https://www.codeproject.com/questions/702028/server-does-not-support-secure-connections
while giving gmail mail id and gmail smtp its working but when using rediffmail and smtp its getting message like Server does not support secure connections. Posted 25-Dec-13 19:05pm ManojMurali
https://www.codeproject.com/Articles/98355/SMTP-Client-with-SSL-TLS
Oct 22, 2015 · The steps involved in SMTP/SSL are as follows: The client connects to the server using TCP. The client negotiates an encrypted connection with the server. The server sends a welcome message using the encrypted connection to the client. The client sends a EHLO command using the encrypted connection to the server.
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