Smtp C# authentification using gmail

Question

1.00/5 (1 vote)

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here is my code:

C#

System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
                    message.To.Add("test@gmail.com");
                    message.Subject = "Nici un Clinet valabil pentru reparare";
                    message.From = new System.Net.Mail.MailAddress("test@gmail.com");
                    message.Body = "Nu mai sunt clienti la care mecanicii sa lucreze";
                    string sendEmailsFrom = "test@gmail.com";
                    string sendEmailsFromPassword = "my_invisible_password";
                    System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp.gmail.com", 587);
                    smtp.EnableSsl = true;
                    smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                    smtp.Credentials = new NetworkCredential(sendEmailsFrom, sendEmailsFromPassword);
                    smtp.Timeout = 20000;
                    smtp.Send(message);

And my error:
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

What is the problem? i can't see it and can't find a solution on google.

Thanks,
Sas Gabriel

What I have tried:

email

Posted 12-Nov-12 10:48am

Gabriel Sas

Updated 2-Mar-17 19:56pm

v2

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Comments

Richard Deeming 19-Dec-16 12:50pm

I see you've edited your question to remove your email address. However, it's still visible in the revision history. You'll need to contact the site administrators to get that removed.

3 solutions

Solution 2

Also please be aware that google will block you from logging in when you do to much connection attempts.

I always use a local email server for development: http://www.hmailserver.com/[^]
It's free. You can simply configure it and run it on your computer, connecting to localhost:2525.
Please be sure to also turn down the ban-option ("auto-ban") of this one.

Posted 12-Nov-12 19:22pm

TorstenH.

Solution 3

Goto Account of Gmail , then select Connected apps & sites Allow less secure apps: ON(if this is off you cannot send mails through apps,or your websites )

Posted 2-Mar-17 19:56pm

sudeep.a

Comments

Graeme_Grant 3-Mar-17 2:05am

Again, any reason why you are replying to a 5-year-old question?

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**Orcun Iyigun** · Accepted Answer · 2012-11-12T10:56:00

Solution 1

You need to set

C#

UseDefaultCredentials = false;

first and after that set the credentials you want to use

C#

Credentials = new NetworkCredential("gabitza.sas@gmail.com", "my_invisible_password");

Also make sure you can login from with your username and password from the mail.google.com page.

Good luck,
OI

Posted 12-Nov-12 10:56am

Orcun Iyigun

Comments

Gabriel Sas 12-Nov-12 17:04pm

also the password wasn't the good one, thanks

veera kishore 3-Oct-16 8:17am

pls tell me i don't know how to add this credential

this is my code pls make sure tell me the solution.

if (ds.Tables[0].Rows.Count > 0)
{
MailMessage Msg = new MailMessage();
// Sender e-mail address.
Msg.From = new MailAddress(txtEmail.Text);
// Recipient e-mail address.
Msg.To.Add(txtEmail.Text);
Msg.Subject = "Your Password Details";
Msg.Body = "Hi, Please check your Login DetailssYour uname: " + ds.Tables[0].Rows[0]["uname"] + "Your pass: " + ds.Tables[0].Rows[0]["pass"] + "";
Msg.IsBodyHtml = true;
// your remote SMTP server IP.
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.Port = 587;
UseDefaultCredentials = false;
smtp.Credentials = new System.Net.NetworkCredential("yourusername@gmail.com", "yourpassword");
Credentials = new NetworkCredential("yourusername@gmail.com", "yourpassword");
smtp.EnableSsl = true;
smtp.Send(Msg);
//Msg = null;
lbltxt.Text = "Your Password Details Sent to your mail";

veera kishore 3-Oct-16 8:18am

i used this usedefaultcredential= false as you said..but i had error here.pls find solution