SMTP Server requires a secure connection or client

Hi Mates

I have an error and have so far google it no luck to it even follow the instructions from stackoverflow regarding the suggested links, even setup my gmail seetings for this. Kindly please assist me further, thanks.

I change the your gmail setting and now you can send the mail.

Note: Please change the gmail password also.

I think the issue is this one, below and dont know each time im creating unique password i always get this back;

Jodinger i sent you mail, please share or reply back to me. I have used this code, maybe something on the gmail settings i dont know why mine seem not working. Im fustrated with this issue now

If gmail .For security allow less secure app

Follw the link

https://devanswers.co/allow-less-secure-apps-access-gmail-account/

Hi I used below code and mail is sent successfully.

System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
mail.From = new MailAddress("[email protected]");
mail.To.Add("[email protected]");
mail.Subject = "test";
mail.Body = "Test Content";
using (System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient())
{
smtp.EnableSsl = true;
smtp.UseDefaultCredentials = false;
smtp.Host = "smtp.gmail.com";
smtp.Credentials = new System.Net.NetworkCredential("[email protected]", "Password ");
smtp.Port = 587;
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Send(mail);
}

"[email protected]">
"smtp.gmail.com" port="587" userName="[email protected]" password="Sunlam150@@" enableSsl="true"/>

sorry m confusion about the screen shot and code which is shared. In code mention that you are using outlook and screen shot mentioned that you are using google. Can you share the which SMTP you are using?.

Note: Both are different behave and coding.

Jodinger

As i have seen the link, its a console application, but the question is now. I m developing MVC web application, how does this is to help me solve this problem? Its a standalone app, if i had to use it what will i have to integrate with that i am looking to achieve here? I dont know because the Authen 2 enable with one device being.

Hi,

could you please check below link. In this link mention that how Create an App-Specific Password if You Have 2-Stage Auth Enabled

so please check.

https://www.codeproject.com/Articles/700211/Csharp-SMTP-Configuration-for-Outlook-Com-SMTP-Hos

Hi Jodinger

I think you raising something i was not aware of, but kindly help the order of this logic below. Hence, Amit Gupta i do have this already set up and view my code for EnableSsl = true

[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public async Task Register(RegisterViewModel model)
{
if (ModelState.IsValid)
{
var user = new ApplicationUser() { UserName = model.UserName };
user.Email = model.Email;
user.ConfirmedEmail = false;
var result = await UserManager.CreateAsync(user, model.Password);
if (result.Succeeded)
{
System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage(
new System.Net.Mail.MailAddress("[email protected]", "Web Registration"),
new System.Net.Mail.MailAddress(user.Email));
mail.Subject = "Email confirmation";
mail.Body = string.Format("Dear {0}
Thank you for your registration, please click on the below link to complete your registration: {1}", user.UserName, Url.Action("ConfirmEmail", "Account", new { Token = user.Id, Email = user.Email }, Request.Url.Scheme));
mail.IsBodyHtml = true;
System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp.outlook.com");
smtp.UseDefaultCredentials = false;
smtp.Credentials = new System.Net.NetworkCredential("[email protected]", "password");
smtp.EnableSsl = true;
smtp.Port = 587;
smtp.Host = "smtp.outlook.com";
smtp.Send(mail);
return RedirectToAction("Confirm", "Account", new { Email = user.Email });
}
else
{
AddErrors(result);
}
}
// If we got this far, something failed, redisplay form 478216
return View(model);
}

Hey

Just be generaly aware that if you are using gmail smtp then you must allow less secure app in your gmail account

https://myaccount.google.com/lesssecureapps?pli=1

and

smtp.EnableSsl = true;

Please review your gmail setting.

Ensure you set SmtpClient.Credentials after calling SmtpClient.UseDefaultCredentials = false.

The order is important as setting SmtpClient.UseDefaultCredentials = false will reset SmtpClient.Credentials to null.

Hi Gcobani,

have you checked this link or try all the solutions mentioned over here?

https://stackoverflow.com/questions/20906077/gmail-error-the-smtp-server-requires-a-secure-connection-or-the-client-was-not

Please make sure you have entered the correct password and select the "Allow access" option when you got the mail to your account.

13 Replies

Know the answer? Post it — somebody with the same question will find it here.

Joginder Banger6y ago
I change the your gmail setting and now you can send the mail.

Note: Please change the gmail password also.
+1
Guest User6y ago
I think the issue is this one, below and dont know each time im creating unique password i always get this back;

+1
Guest User6y ago
Jodinger i sent you mail, please share or reply back to me. I have used this code, maybe something on the gmail settings i dont know why mine seem not working. Im fustrated with this issue now
+1
Laxmidhar Sahoo6y ago
hi
If gmail .For security allow less secure app
Follw the link
https://devanswers.co/allow-less-secure-apps-access-gmail-account/
+1
Joginder Banger6y ago
Hi I used below code and mail is sent successfully.
System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
            mail.From = new MailAddress("[email protected]");
            mail.To.Add("[email protected]");
            mail.Subject = "test";
            mail.Body = "Test Content";


            using (System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient())
            {
                smtp.EnableSsl = true;
                smtp.UseDefaultCredentials = false;
                smtp.Host = "smtp.gmail.com";
                smtp.Credentials = new System.Net.NetworkCredential("[email protected]", "Password ");

                smtp.Port = 587;
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtp.Send(mail);
            }
+2
Guest User6y ago
3. "[email protected]">
4. "smtp.gmail.com" port="587" userName="[email protected]" password="Sunlam150@@" enableSsl="true"/>
Hi Joginder
Here is my code,
1. [HttpPost]
2. [AllowAnonymous]
3. [ValidateAntiForgeryToken]
4. public async Task Register(RegisterViewModel model)
5. {
6. if (ModelState.IsValid)
7. {
8. var user = new ApplicationUser() { UserName = model.UserName };
9. user.Email = model.Email;
10. user.ConfirmedEmail = false;
11. var result = await UserManager.CreateAsync(user, model.Password);
12. if (result.Succeeded)
13. {
14. System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage(
15. new System.Net.Mail.MailAddress("[email protected]", "Web Registration"),
16. new System.Net.Mail.MailAddress(user.Email));
17. mail.Subject = "Email confirmation";
18. mail.Body = string.Format("Dear {0}
  Thank you for your registration, please click on the below link to complete your registration: {1}", user.UserName, Url.Action("ConfirmEmail", "Account", new { Token = user.Id, Email = user.Email }, Request.Url.Scheme));
19. mail.IsBodyHtml = true;
22. System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp.gmail.com");
23. smtp.UseDefaultCredentials = false;
24. smtp.Credentials = new System.Net.NetworkCredential("[email protected]", "password");
25. smtp.EnableSsl = true;
27. smtp.Port = 587;
28. smtp.Host = "smtp.gmail.com";
29. smtp.Send(mail);
30. return RedirectToAction("Confirm", "Account", new { Email = user.Email });
31. }
32. else
33. {
34. AddErrors(result);
35. }
36. }
38. // If we got this far, something failed, redisplay form 478216
39. return View(model);
40. }