Error when sending an email c# - c#

I try to send an email (with gmail) in C#. I check the solutions I can find on google but it never works for me, I always have the error :
SMTP server requires a secure connection or the client was not
authenticated. The response from the server Was: 5.5.1 Authentication
Required.
This is an exampe of code :
string smtpAddress = "smtp.gmail.com";
int portNumber = 587;
bool enableSSL = true;
string emailFrom = "*****#gmail.com";
string password = "*****";
string emailTo = "******#gmail.com";
string subject = "Hello";
string body = "Hello, I'm just writing this to say Hi!";
using (MailMessage mail = new MailMessage())
{
mail.From = new MailAddress(emailFrom);
mail.To.Add(emailTo);
mail.Subject = subject;
mail.Body = body;
mail.IsBodyHtml = true;
using (SmtpClient smtp = new SmtpClient(smtpAddress, portNumber))
{
smtp.Credentials = new NetworkCredential(emailFrom, password);
smtp.EnableSsl = enableSSL;
smtp.Send(mail);
}
}


The MSDN says that : 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.
So you need to set smtp.UseDefaultCredentials = false; before assigning Credentials, So your code will looks like the following:
using (SmtpClient smtp = new SmtpClient(smtpAddress, portNumber))
{
smtp.UseDefaultCredentials = false;
smtp.Credentials = new NetworkCredential(emailFrom, password);
smtp.EnableSsl = enableSSL;
smtp.Send(mail);
}


I find the solution which works for me. The solution proposed by un-lucky
was good but I need to configure gmail account.
So the code is :
string smtpAddress = "smtp.gmail.com";
int portNumber = 587;
bool enableSSL = true;
string emailFrom = "****#gmail.com";
string password = "*****";
string emailTo = "****#gmail.com";
string subject = "Hello";
string body = "Hello, I'm just writing this to say Hi!";
using (MailMessage mail = new MailMessage())
{
mail.From = new MailAddress(emailFrom);
mail.To.Add(emailTo);
mail.Subject = subject;
mail.Body = body;
using (SmtpClient smtp = new SmtpClient(smtpAddress, portNumber))
{
smtp.UseDefaultCredentials = false;
smtp.Credentials = new NetworkCredential(emailFrom, password);
smtp.EnableSsl = enableSSL;
smtp.Send(mail);
}
}
Moreover in your gmail account, you have to make this changes.
gmail account changes

Related

Sending email using gmail smtp server

I have been trying for a long time to send a mail from a Gmail account to a gmail account using the below code.
using (MailMessage mm = new MailMessage(txtEmail.Text, txtTo.Text))
{
mm.Subject = txtSubject.Text;
mm.Body = txtBody.Text;
if (fuAttachment.HasFile)
{
string FileName = Path.GetFileName(fuAttachment.PostedFile.FileName);
mm.Attachments.Add(new Attachment(fuAttachment.PostedFile.InputStream, FileName));
}
mm.IsBodyHtml = false;
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.EnableSsl = true;
NetworkCredential NetworkCred = new NetworkCredential(txtEmail.Text, txtPassword.Text);
smtp.UseDefaultCredentials = true;
smtp.Credentials = NetworkCred;
smtp.Port = 587;
smtp.Send(mm);
ClientScript.RegisterStartupScript(GetType(), "alert", "alert('Email sent.');", true);
}
After the execution reaches "smtp.Send(mm)" the browser says waiting and after 2 minutes I get the exception saying "Failure Sending Email"
And the following Error message
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 ...:587" (some IP)
I have searched a lot for this but haven't found a solution. Please help me solve this issue.
Thank you.

Try This One.
public static string SendMail(string stHtmlBody, string stSubject, string stToEmailAddresses)
{
string stReturnText = string.Empty;
try
{
if (!string.IsNullOrEmpty(stToEmailAddresses))
{
//Set SmtpClient to send Email
string stFromUserName = "fromusername";
string stFromPassword ="frompassword";
int inPort = Convert.ToInt32(587);
string stHost = "smtp.gmail.com";
bool btIsSSL =true;
MailAddress to = new MailAddress(stToEmailAddresses);
MailAddress from = new MailAddress("\"" + "Title" + "\" " + stFromUserName);
MailMessage objEmail = new MailMessage(from, to);
objEmail.Subject = stSubject;
objEmail.Body = stHtmlBody.ToString();
objEmail.IsBodyHtml = true;
objEmail.Priority = MailPriority.High;
SmtpClient client = new SmtpClient();
System.Net.NetworkCredential auth = new System.Net.NetworkCredential(stFromUserName, stFromPassword);
client.Host = stHost;
client.Port = inPort;
client.UseDefaultCredentials = false;
client.Credentials = auth;
client.EnableSsl = btIsSSL;
client.Send(objEmail);
return stReturnText;
}
}
catch (Exception ex)
{
}
return stReturnText;
}

First of all, I think you should use
UseDefaultCredentials = false;
And
smtp.DeliveryMethod = SmtpDeliveryMethod.Network
You also need to allow less secure apps to access your account

I had a similar attempt but using Java. I was not successful doing that after a lot of search. I then used the Yahoo! SMTP, which worked very easily. Maybe you can try that.

SMTP Live.com "Failure sending mail"

What is wrong with these Code? Alltimes it throws an Exception "{"Failure sending mail."}"! And i dont know why. Please help me.
Edit : Inner Exception : {"Unable to connect to the remote server"}
string smtpAddress = "smtp.live.com";
int portNumber = 587;
bool enableSSL = true;
string emailFrom = "myemail#live.com";
string password = "myPassword";
string emailTo = "otherEmail#live.com";
string subject = "Hello";
string body = "Hello, I'm just writing this to say Hi!";
using (MailMessage mail = new MailMessage())
{
mail.From = new MailAddress(emailFrom);
mail.To.Add(emailTo);
mail.Subject = subject;
mail.Body = body;
mail.IsBodyHtml = false;
using (SmtpClient smtp = new SmtpClient(smtpAddress, portNumber))
{
smtp.Credentials = new NetworkCredential(emailFrom, password);
smtp.EnableSsl = enableSSL;
smtp.Send(mail);
}
}

Remove using keyword when send the mail like this:
from:
using (SmtpClient smtpClient = new SmtpClient())
to:
SmtpClient smtpClient = new SmtpClient();
Remove braces also like this:
smtp.Credentials = new NetworkCredential(emailFrom, password);
smtp.EnableSsl = enableSSL;
smtp.Send(mail);

Not able to send mail from localhost through yahoo,gmail smtp server

What is wrong in below mentioned asp.net code while sending test mail from my localhost web application?
Error: The SMTP server requires a secure connection or the client was
not authenticated. The server response was: 5.7.1 Authentication
required
string smtpAddress = "smtp.mail.yahoo.com";
int portNumber = 587;
bool enableSSL = true;
string emailFrom = "abcdefg#gmail.com";
string password = "12345";
string emailTo = "zyxw#gmail.com";
string subject = "Hello";
string body = "Hello, I'm just writing this to say Hi!";
using (MailMessage mail = new MailMessage())
{
mail.From = new MailAddress(emailFrom);
mail.To.Add(emailTo);
mail.Subject = subject;
mail.Body = body;
mail.IsBodyHtml = true;
// Can set to false, if you are sending pure text.
using (SmtpClient smtp = new SmtpClient(smtpAddress, portNumber))
{
smtp.UseDefaultCredentials = false;
smtp.Credentials = new NetworkCredential(emailFrom, password);
smtp.EnableSsl = enableSSL;
smtp.Send(mail);
}
}

The server requires an authentication. Yahoo doesn't just send emails for anybody. I don't think you can send an email through their gateway using a Google account.

Sending a gmail email

I am trying to send an email through and C# application (Console). Actually I would like it to send an email to any type of email but for the time being if I can get it to send to a gmail account I would be happy enough.
I just want to be able to get this to send to a gmail account for the time being?
Whole Program:
namespace EmailAddress
{
class Program
{
static void Main(string[] args)
{
Program test = new Program();
test.email_send();
}
public void email_send()
{
MailMessage mail = new MailMessage();
SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
mail.From = new MailAddress("hg#gmail.com");
mail.To.Add("hg#gmail.com");
mail.Subject = "Test Mail - 1";
mail.Body = "Your attachment is accessible on your computer!";
System.Net.Mail.Attachment attachment;
attachment = new System.Net.Mail.Attachment("g:/example1.txt");
mail.Attachments.Add(attachment);
SmtpServer.Port = 587;
SmtpServer.Credentials = new System.Net.NetworkCredential("your mail#gmail.com", "your password");
SmtpServer.EnableSsl = true;
SmtpServer.Send(mail);
}
}
}
New code: Doesn't hang but will not send the message to the inbox
static void Main(string[] args)
{
Program test = new Program();
//test.email_send();
test.CreateTestMessage4();
}
public void email_send()
{
MailMessage mail = new MailMessage();
SmtpClient smtp = new SmtpClient("smtp.gmail.com");
mail.From = new MailAddress("g#gmail.com");
mail.To.Add("g#gmail.com");
mail.Subject = "Test Mail - 1";
mail.Body = "Your attachment is accessible on your computer!";
System.Net.Mail.Attachment attachment;
attachment = new System.Net.Mail.Attachment("g:\\example1.txt");
mail.Attachments.Add(attachment);//list of attachements
smtp.Port = 587;//google standard -- most of the time wouldn't not set
smtp.EnableSsl = true;
smtp.UseDefaultCredentials = true;
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Credentials = new System.Net.NetworkCredential("*","*");
smtp.Send(mail);
Console.WriteLine("-- Sending Email --");
Console.ReadLine();
}
Can someone try this code and see if it works. For some reason this isn't working so I would like to have someone's fresh perspective of this. I just call this in the main method for an instance of the class.
public void email_send()
{
MailMessage mail = new MailMessage();
SmtpClient smtp = new SmtpClient("smtp.gmail.com");
mail.From = new MailAddress("your email address");
mail.To.Add("your email address");
mail.Subject = "Test Mail - 1";
mail.Body = "Your attachment is accessible on your computer!";
System.Net.Mail.Attachment attachment;
attachment = new System.Net.Mail.Attachment("g:\\example1.txt");
mail.Attachments.Add(attachment);//list of attachements
//smtp.Port = 587;//google standard -- most of the time wouldn't not set
//smtp.EnableSsl = true;
//smtp.UseDefaultCredentials = true;
//smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
//smtp.Credentials = new System.Net.NetworkCredential("your address",
"your password");
smtp.Port = 587;
smtp.Host = "smtp.gmail.com";
smtp.UseDefaultCredentials = false;
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.EnableSsl = true;
smtp.Credentials = new System.Net.NetworkCredential("*", "*"); smtp.Send(mail);
Console.WriteLine("-- Sending Email --");
Console.ReadLine();
}

Your code is close:
MailMessage mail = new MailMessage();
using (SmtpClient smtp = new SmtpClient("smtp.gmail.com")) {
mail.From = new MailAddress("haufdoug#gmail.com");
mail.To.Add("haufdoug#gmail.com");
mail.Subject = "Test Mail - 1";
mail.Body = "Your attachment is accessible on your computer!";
System.Net.Mail.Attachment attachment;
attachment = new System.Net.Mail.Attachment("g:\\example1.txt");
mail.Attachments.Add(attachment);
smtp.Port = 587;
smtp.EnableSsl = true;
smtp.UseDefaultCredentials = false;
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Credentials = new System.Net.NetworkCredential("your mail#gmail.com", "your password");
smtp.Send(mail);
}
Now, regarding some of your other questions.
Port 587 is used by Google only. Typically the mail server you connect to will tell you what port to use for SMTP mail; Google said there's is 587.
For sending through other servers you typically won't set the port number.
side notes:
SmtpClient implements the IDisposable interface. So it should be wrapped in a using clause to ensure it is properly disposed of when complete. Unless you are using the .SendAsync() method.
I changed the variable name from SmtpServer to smtp for two reasons. First, naming convention. Variables inside a method are recommended to be camel case (forExampleThis). Second, SmtpServer is a misnomer as the object is an SmtpClient. Those are very different things and it's just bad practice to misname things.

Can you try this, it's working for me:
SmtpClient SmtpServer = new SmtpClient();
SmtpServer.Port = 587;
SmtpServer.Host = smtp.gmail.com;
SmtpServer.UseDefaultCredentials = false;
SmtpServer.DeliveryMethod = SmtpDeliveryMethod.Network;
SmtpServer.EnableSsl = true;
SmtpServer.Credentials = new System.Net.NetworkCredential("your mail#gmail.com", "your password");

Send email using System.Net.Mail through gmail

I want to send a email through gmail server. I have put the following code but it is getting stuck while sending. Any idea please....
MailMessage mail = new MailMessage();
mail.From = new System.Net.Mail.MailAddress("apps#xxxx.com");
//create instance of smtpclient
SmtpClient smtp = new SmtpClient();
smtp.Port = 465;
smtp.UseDefaultCredentials = true;
smtp.Host = "smtp.gmail.com";
smtp.EnableSsl = true;
//recipient address
mail.To.Add(new MailAddress("yyyy#xxxx.com"));
//Formatted mail body
mail.IsBodyHtml = true;
string st = "Test";
mail.Body = st;
smtp.Send(mail);
The xxxx.com is a mail domain in Google apps.
Thanks...

MailMessage mail = new MailMessage();
mail.From = new System.Net.Mail.MailAddress("apps#xxxx.com");
// The important part -- configuring the SMTP client
SmtpClient smtp = new SmtpClient();
smtp.Port = 587; // [1] You can try with 465 also, I always used 587 and got success
smtp.EnableSsl = true;
smtp.DeliveryMethod = SmtpDeliveryMethod.Network; // [2] Added this
smtp.UseDefaultCredentials = false; // [3] Changed this
smtp.Credentials = new NetworkCredential(mail.From, "password_here"); // [4] Added this. Note, first parameter is NOT string.
smtp.Host = "smtp.gmail.com";
//recipient address
mail.To.Add(new MailAddress("yyyy#xxxx.com"));
//Formatted mail body
mail.IsBodyHtml = true;
string st = "Test";
mail.Body = st;
smtp.Send(mail);

I tried the above C# code to send mail from Gmail to my Corporate ID. While executing the application the control stopped indefinitely at the statement smtp.Send(mail);
While Googling, I came across a similar code, that worked for me. I am posting that code here.
class GMail
{
public void SendMail()
{
string pGmailEmail = "fromAddress#gmail.com";
string pGmailPassword = "GmailPassword";
string pTo = "ToAddress"; //abc#domain.com
string pSubject = "Test From Gmail";
string pBody = "Body"; //Body
MailFormat pFormat = MailFormat.Text; //Text Message
string pAttachmentPath = string.Empty; //No Attachments
System.Web.Mail.MailMessage myMail = new System.Web.Mail.MailMessage();
myMail.Fields.Add
("http://schemas.microsoft.com/cdo/configuration/smtpserver",
"smtp.gmail.com");
myMail.Fields.Add
("http://schemas.microsoft.com/cdo/configuration/smtpserverport",
"465");
myMail.Fields.Add
("http://schemas.microsoft.com/cdo/configuration/sendusing",
"2");
//sendusing: cdoSendUsingPort, value 2, for sending the message using
//the network.
//smtpauthenticate: Specifies the mechanism used when authenticating
//to an SMTP
//service over the network. Possible values are:
//- cdoAnonymous, value 0. Do not authenticate.
//- cdoBasic, value 1. Use basic clear-text authentication.
//When using this option you have to provide the user name and password
//through the sendusername and sendpassword fields.
//- cdoNTLM, value 2. The current process security context is used to
// authenticate with the service.
myMail.Fields.Add
("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
//Use 0 for anonymous
myMail.Fields.Add
("http://schemas.microsoft.com/cdo/configuration/sendusername",
pGmailEmail);
myMail.Fields.Add
("http://schemas.microsoft.com/cdo/configuration/sendpassword",
pGmailPassword);
myMail.Fields.Add
("http://schemas.microsoft.com/cdo/configuration/smtpusessl",
"true");
myMail.From = pGmailEmail;
myMail.To = pTo;
myMail.Subject = pSubject;
myMail.BodyFormat = pFormat;
myMail.Body = pBody;
if (pAttachmentPath.Trim() != "")
{
MailAttachment MyAttachment =
new MailAttachment(pAttachmentPath);
myMail.Attachments.Add(MyAttachment);
myMail.Priority = System.Web.Mail.MailPriority.High;
}
SmtpMail.SmtpServer = "smtp.gmail.com:465";
SmtpMail.Send(myMail);
}
}

Set
smtp.UseDefaultCredentials = false
and use
smtp.Credentials = new NetworkCredential(gMailAccount, password);

This have worked for me:
MailMessage message = new MailMessage("myemail#gmail.com", toemail, subjectEmail, comments);
message.IsBodyHtml = true;
try {
SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
client.Timeout = 2000;
client.EnableSsl = true;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
//client.Credentials = CredentialCache.DefaultNetworkCredentials;
client.UseDefaultCredentials = false;
client.Credentials = new System.Net.NetworkCredential("myemail#gmail.com", "mypassord");
client.Send(message);
message.Dispose();
client.Dispose();
}
catch (Exception ex) {
Debug.WriteLine(ex.Message);
}
BUT (as of the time of this writing - Oct 2017)
You need to ENABLE "Allow less secure apps" inside the option "apps with account access" at the "My account" google security/privacy settings (https://myaccount.google.com)

I realise this is an answer to a very old question, with lots of other good answers. I am posting this code to include some of the useful comments posted by other users such as Using Statements and newer methods where some answers have obsolete methods. This code was tested and working as of 11 July 2018.
If sending via your GMail Account ensure that Allow less secure apps is enabled from your control panel
Class Code C#:
public class Email
{
public void NewHeadlessEmail(string fromEmail, string password, string toAddress, string subject, string body)
{
using (System.Net.Mail.MailMessage myMail = new System.Net.Mail.MailMessage())
{
myMail.From = new MailAddress(fromEmail);
myMail.To.Add(toAddress);
myMail.Subject = subject;
myMail.IsBodyHtml = true;
myMail.Body = body;
using (System.Net.Mail.SmtpClient s = new System.Net.Mail.SmtpClient("smtp.gmail.com", 587))
{
s.DeliveryMethod = SmtpDeliveryMethod.Network;
s.UseDefaultCredentials = false;
s.Credentials = new System.Net.NetworkCredential(myMail.From.ToString(), password);
s.EnableSsl = true;
s.Send(myMail);
}
}
}
}
Class Code VB:
Public Class Email
Sub NewHeadlessEmail(fromEmail As String, password As String, toAddress As String, subject As String, body As String)
Using myMail As System.Net.Mail.MailMessage = New System.Net.Mail.MailMessage()
myMail.From = New MailAddress(fromEmail)
myMail.To.Add(toAddress)
myMail.Subject = subject
myMail.IsBodyHtml = True
myMail.Body = body
Using s As New Net.Mail.SmtpClient("smtp.gmail.com", 587)
s.DeliveryMethod = SmtpDeliveryMethod.Network
s.UseDefaultCredentials = False
s.Credentials = New Net.NetworkCredential(myMail.From.ToString(), password)
s.EnableSsl = True
s.Send(myMail)
End Using
End Using
End Sub
End Class
Usage C#:
{
Email em = new Email();
em.NewHeadlessEmail("myemail#gmail.com", "password", "recipient#email.com", "Subject Text", "Body Text");
}
Usage VB:
Dim em As New Email
em.NewHeadlessEmail("myemail#gmail.com", "password", "recipient#email.com", "Subject Text", "Body Text")

Use Port number 587
With the following code, it will work successfully.
MailMessage mail = new MailMessage();
mail.From = new MailAddress("abc#mydomain.com", "Enquiry");
mail.To.Add("abcdef#yahoo.com");
mail.IsBodyHtml = true;
mail.Subject = "Registration";
mail.Body = "Some Text";
mail.Priority = MailPriority.High;
SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
//smtp.UseDefaultCredentials = true;
smtp.Credentials = new System.Net.NetworkCredential("xyz#gmail.com", "<my gmail pwd>");
smtp.EnableSsl = true;
//smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Send(mail);
But, there is a problem with using gmail. The email will be sent successfully, but the recipient inbox will have the gmail address in the 'from address' instead of the 'from address' mentioned in the code.
To solve this, please follow the steps mentioned at the following link.
http://karmic-development.blogspot.in/2013/10/send-email-from-aspnet-using-gmail-as.html
before following all the above steps, you need to authenticate your gmail account to allow access to your application and also the devices. Please check all the steps for account authentication at the following link:
http://karmic-development.blogspot.in/2013/11/allow-account-access-while-sending.html

ActiveUp.Net.Mail.SmtpMessage smtpmsg = new ActiveUp.Net.Mail.SmtpMessage();
smtpmsg.From.Email = "abcd#test.com";
smtpmsg.To.Add(To);
smtpmsg.Bcc.Add("vijay#indiagreat.com");
smtpmsg.Subject = Subject;
smtpmsg.BodyText.Text = Body;
smtpmsg.Send("mail.test.com", "abcd#sss.com", "user#1234", ActiveUp.Net.Mail.SaslMechanism.Login);

simple code works
MailMessage mail = new MailMessage();
mail.To.Add(to);
mail.From = new MailAddress(from);
mail.Subject = subject;
mail.Body = body;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient("smtp.gmail.com",587);
smtp.EnableSsl = true;
smtp.UseDefaultCredentials = false;
smtp.Credentials = new System.Net.NetworkCredential(address, password);
smtp.Send(mail);

Categories

Resources