I have a piece of code that sends email.. heres the code
This is not working for me. This a remote smtp service ... and i double checked that email web access works fine .. i can login using the gui, recieve and send emails.
But when i try to do it through code .. it fails with the message ...
{System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 No AUTH command has been given.
Can anybody advise ... and also they dont have EWS exposed ie.e exchange web service ./.. this is the way to go ..
port is 25 and no SSL or TLS
Button b = sender as Button;
try
{
MailMessage msg = new MailMessage(senderEmail, recieverEmail, "afdasfas", "safasfa");
//MailMessage msg = new MailMessage(senderEmail, recieverEmail, subject, subject);
System.Net.Mail.SmtpClient mailclient = new System.Net.Mail.SmtpClient(EmailSmtpServer, outgoingPort);
System.Net.NetworkCredential auth = new System.Net.NetworkCredential(senderEmail, senderPassword);
mailclient.Host = EmailSmtpServer;
mailclient.UseDefaultCredentials = false;
mailclient.Credentials = auth;
mailclient.Send(msg);
MessageBox.Show(b.Content + ":WORKED");
}
catch (Exception e4)
{
MessageBox.Show(b.Content + ": " +e4.Message);
MessageBox.Show(b.Content + ": " + e4.StackTrace);
}
I don't think you want to set
mailclient.UseDefaultCredentials = true;
Read more about this option here.
You should also test that you can actually send email through that smtp server.
Try connecting via telnet and authorizing. There are also plenty of services that will let you send a test message online (http://pingability.com/smtptest.jsp for example).
System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 No AUTH command has been given.
you are attempting to login without sending the AUTH command first. this is why your web gui, which auto-inserts it's own AUTH commands works but your current client-application is not receiving a command from you to relay onto the server, but the server requires authentication.
maybe you need to Add mailclient.EnableSsl = true;
Related
I want to do an application for sending emails in C# windows application.I used smtp server,but I don't want to set the network credentials. So I set it as true.but am getting error.
The SMTP server requires a secure connection or the client was not
authenticated. The server response was: 5.5.1 Authentication Required.
Learn more at
Here is the code:
SmtpClient oClient = new SmtpClient();
oClient.Host = "smtp.gmail.com";
oClient.Port = 25;
oClient.UseDefaultCredentials = true;
oClient.Credentials = new System.Net.NetworkCredential();
oClient.EnableSsl = true;
MailMessage oMail = new MailMessage();
oMail.To.Add(txtTo.Text.Trim());
oMail.From = new MailAddress("testmail#gmail.com");
oMail.Subject = txtSubject.Text;
oMail.Body = txtBody.Text;
oMail.IsBodyHtml = true;
oClient.Send(oMail);
MessageBox.Show("Mail Send");
here I set the host as gmail.com,I need to send and receive mails using all email service providers.So how can I set the host and port?
gmail uses port 587
oClient.Port = 587;
You may also want to set UseDefaultCredentials to false and explicitly declare username and password. By declaring it to be true, you are trying to log into your gmail account using your windows credentials.
oClient.UseDefaultCredentials = false;
oClient.Credentials = new NetworkCredential("email#gmail.com", "password");
Also, in gmail security, you will need to allow Less Secure Applications.
Finally, you need to change how your Mail.To is populated:
oMail.To.Add(new MailAddress(txtTo.Text.Trim()));
Google may block sign in attempts from some apps or devices when you try to login from some app. You need to go to security settings at your gmail and enable less secure apps . So that you will be able to login from all apps. Go to Allow less secure apps and choose Allow to let less secure apps access your Google account. Have a look at this link may useful.
I have some code that I am attempting to use to send emails from my ASP.NET MVC 5 website. From what I have read I am doing this the right way and the code is correct
public static Task SendEmailAsync(IEnumerable<string> to,
IEnumerable<string> cc, string body)
{
if (to == null || to.Count() == 0)
return null;
if (String.IsNullOrEmpty(body))
throw new ArgumentNullException("body of the email is empty");
// Send email.
return Task.Factory.StartNew(() =>
{
// Client setup.
using (SmtpClient smtpClient = new SmtpClient("smtp.servername.com", 25)) // Tried 587 too.
{
smtpClient.Credentials = new System.Net.NetworkCredential()
{
UserName = Constants.AdminEmailAddress,
Password = Constants.AdminPwd
};
smtpClient.UseDefaultCredentials = true;
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.EnableSsl = true;
// Mail message.
using (MailMessage mail = new MailMessage())
{
mail.Body = body;
mail.From = new MailAddress(Constants.AdminEmailAddress, "Business Name Here");
foreach (var a in to)
mail.To.Add(new MailAddress(a));
if (cc != null)
foreach (var a in cc)
mail.CC.Add(new MailAddress(a));
smtpClient.Send(mail); // Here I get exception.
}
}
});
}
But on the line marked above I get
System.Net.Mail.SmtpException: Unable to connect to the remote server A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond NNN.NNN.NNN.NNN:MMM
I understand that this is clearly saying that the client cannot connect, but these are the exact same details that I am using to send email from Microsoft Outlook and that works.
Why can't I connect to the mail server using these credentials, what am I missing?
I am aware that I may have to contact the mail service provider and ask for permissions, but this is my first attempt at this and would like some clarification about what to do. I have looked at mandrillapp.com which provides a mail service, is this a good option, can someone advise?
Thank for your time.
Note, I have read
How to send email from Asp.net Mvc-3?
http://www.c-sharpcorner.com/UploadFile/sourabh_mishra1/sending-an-e-mail-using-Asp-Net-mvc/
send email from MVC 4 ASP.NET app
Update
Following the very helpful suggestions by #Dave Zych below I have removed the SmtpException but I now have System.Security.Authentication.AuthenticationException saying "The remote certificate is invalid according to the validation procedure.". So I am in the same boat and still cannot send email.
Don't specify UseDefaultCredentials (or set it to false). That causes it to use the credentials of the currently logged in user, not what you set in the Credentials property.
From MSDN:
Some SMTP servers require that the client be authenticated before the server sends e-mail on its behalf. Set this property to true when this SmtpClient object should, if requested by the server, authenticate using the default credentials of the currently logged on user. For client applications, this is the desired behavior in most scenarios.
...
If the UseDefaultCredentials property is set to false, then the value set in the Credentials property will be used for the credentials when connecting to the server. If the UseDefaultCredentials property is set to false and the Credentials property has not been set, then mail is sent to the server anonymously.
I was new to SMTP client in C#. So I decided to test it with my credentials. I built an ASP.NET Web forms application that has a Contact Us page on which I am trying to send an email to whoever person fills the form.
I tried sample code after going through this article - https://www.c-sharpcorner.com/UploadFile/87b416/sending-a-simple-email-using-smtpclient-in-C-Sharp/
I have one account in Yahoo so I used its SMTP domain "smtp.mail.yahoo.com" with port number: 465, then my app always threw Timeout exception. So I decided to try with Google's server "smtp.gmail.com" with "587" port and now it raised different exception with message:
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required
I don't understand what are the prerequisites for working with SMTP on secure servers like Google and Yahoo. Please someone explain.
Also note that I didn't have 2 step verification enabled for my Google account, just to make it clear since some questions on SO have mentioned that this might be the problem.
I also read this question but I am testing directly on my machine - Gmail Error :The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required
In case if it helps, here is the sample code:
try
{
MailMessage m = new MailMessage();
m.From = new MailAddress("dummy123#gmail.com");
m.To.Add(new MailAddress("dummyreceiver123#gmail.com"));
m.Subject = TBSub.Text;
m.Body = TBBody.Text;
m.IsBodyHtml = true;
NetworkCredential nc = new NetworkCredential();
nc.UserName = "dummy123"
nc.Password = "dummy#123";
SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
smtp.Credentials = nc;
smtp.EnableSsl = true;
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Send(m);
}
catch (Exception ex)
{
//Log this error
}
I just tested out your code it works fine you just need to modify this section:
nc.UserName = "test"
nc.Password = "password";
This has to be a valid gmail or google app email along with the password for the smtp connection to work properly. I would recommend that you put in your own for testing purposes, and then modify this to have your email as well:
m.From = new MailAddress("yourEmail#gmail.com");
m.To.Add(new MailAddress("yourEmail#gmail.com"));
Just so that you can validate that your message is being passed from your function.
I have read other answers on the stackoverflow. but none of the solutions work for me.
I'm trying to send email through live.com, but unable to it.
The error message:
mailbox unavailable. The server response was: 5.7.3 requested action aborted;
user not authenticated
or error message:
System.Net.Mail.SmtpException: Service not available,
closing transmission channel.
The server response was: Cannot connect to SMTP server 65.55.176.126
(65.55.176.126:587), NB connect error 1460
The code:
MailMessage mail = new MailMessage();
mail.From = new MailAddress("email#live.com");
mail.To.Add("someone#someone.com");
mail.Subject = "hello";
mail.Body = "awefkljj kawefl";
mail.IsBodyHtml = false;
SmtpClient smtp = new SmtpClient("smtp.live.com", 587);
smtp.EnableSsl = true;
smtp.Credentials = new NetworkCredential("email#live.com", "password");
smtp.Send(mail);
Are you able to send the email by using above code?
It works before, last year, but it is no more working now.
I'm not sure what has been changed to live.com email server.
What new settings or parameters should apply?
I ran into an issue where I was unable to send emails using the smtp.live.com SMTP server from certain hosts -- particulary Azure hosts. In my case, the SMTP attempt was from a host that I had never used to sign-in previously, so the attempt was blocked with the 5.7.3 error:
Mailbox unavailable. The server response was: 5.7.3 requested action aborted; user not authenticated
The solution was to browse to the account settings, locate the SMTP request in its recent activity, and select "This was me":
Tested and it works (different host address and a few other property set):
using (var client = new SmtpClient("smtp-mail.outlook.com")
{
Port = 587,
DeliveryMethod = SmtpDeliveryMethod.Network,
UseDefaultCredentials = false,
EnableSsl = true,
Credentials = new NetworkCredential(_sender, _password)
})
{
using (var mail = new MailMessage(_sender, _recipient)
{
Subject = _subject,
Body = _message
})
{
client.Send(mail);
}
}
Also, if the account has two-step verification turned on, you'll have to generate an app password and use that instead.
Your code works for me without any changes with a live.com address. I am able to generate the same exception by simply putting an incorrect password.
I would suggest following checks:
Did the user change password recently? Are you able to login with the credentials provided over the web interface?
if yes, does your program uses the exact same credentials? please note that white space can be your enemy.
I try to send an email using the amazon SES service. My code is taken from their documantation:
public static void SendWithSMTP(string username, string password, string host, int port)
{
using (var client = new System.Net.Mail.SmtpClient(host, port))
{
client.Credentials = new System.Net.NetworkCredential(username, password);
client.EnableSsl = true;
client.Send("from#example.com", "to#example.com", "This is a test subject.", "This is a test email message body.");
}
the problem is that i get the following exception:
The SMTP server requires a secure connection or the client was not
authenticated. The server response was: Authentication required
Is there anyone who had the same or similar problem? Any suggestions on this problem?
this seems that the key you are using is wrong, please confirm this otherwise create a new one.
Ensure that the sender id is also permitted to send email the same can be done from Amazon ses control panel.
In your code you must permit from#example.com to send email