Sending email using gmail smtp server - c#

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.

Related

Send mail using yahoo in ASP.Net

I have a web server at home running IIS 10 and .Net 4.8.
I am trying to send an email through a C#.Net, using the following yahoo stmp service call.
However, I cannot seem to get it to work? Whenever I try to execute the following code, the web page seems to be loading for about 30 seconds, then returns an "SMTP Server returned an invalid response" error message, which apparently doesn't mean anything specific? This is getting pretty frustrating as I've been on this for over 4 hours now... so thanks for any help!
using (MailMessage mm = new MailMessage("uneviesystems#yahoo.com", "MaxOvrdrv007#yahoo.ca"))
{
mm.Subject = "test";
mm.Body = "testing maudine...";
mm.IsBodyHtml = false;
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.mail.yahoo.com";
smtp.EnableSsl = true;
NetworkCredential NetworkCred = new NetworkCredential("uneviesystems#yahoo.com", "*******");
smtp.UseDefaultCredentials = true;
smtp.Credentials = NetworkCred;
smtp.Port = 465;
try
{
smtp.Send(mm);
}
catch(SmtpException ex)
{
string p = "";
}
}

Port 465 isn't supported by System.Net.Mail.SmtpClient -
http://msdn.microsoft.com/en-us/library/system.net.mail.smtpclient.enablessl.aspx
You could try using port 587 instead (if Yahoo supports it) and disable SSL.

try using application password instead account password. You can generate application password in account settings.

Send your email asynchronously and format your code to dispose client properly.
using (var message = new MailMessage())
{
message.To.Add(new MailAddress("recepient email", "receipient name"));
message.From = new MailAddress("your email", "your name");
message.Subject = "My subject";
message.Body = "My message";
message.IsBodyHtml = false; // change to true if body msg is in html
using (var client = new SmtpClient("smtp.mail.yahoo.com"))
{
client.UseDefaultCredentials = false;
client.Port = 587;
client.Credentials = new NetworkCredential("your email", "your password");
client.EnableSsl = true;
try
{
await client.SendMailAsync(message); // Email sent
}
catch (Exception e)
{
// Email not sent, log exception
}
}
}

Error when sending an email 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

Not able to send emails through my asp.net application

I am getting Time-out Error.
I am not able to send email using this code. I tried almost every
possible way but of no use.
try
{
string myString = "Hello I am new email message. I am delivered for testing.";
MailMessage mm = new MailMessage("XXXXXXXXXX", "XXXXXXXXXX");
//mm.CC.Add("XXXXXXXXXX");
mm.Subject = "Subject have been successfully placed.";
mm.Body = myString.ToString();
mm.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.EnableSsl = true;
System.Net.NetworkCredential NetworkCred = new System.Net.NetworkCredential();
NetworkCred.UserName = "XXXXXXXXXX";
NetworkCred.Password = "XXXXXXXXXX";
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.UseDefaultCredentials = true;
smtp.Credentials = NetworkCred;
smtp.Port = 465;
smtp.Send(mm);
Request.Cookies.Clear();
}
catch (Exception ee)
{
Response.Write(ee.Message);
}

try this
private void SendMail()
{
MailMessage mail = new MailMessage();
SmtpClient mailClient = new SmtpClient("smtp.gmail.com", 587);
mail.From = new MailAddress("Setfromaddress");
mail.To.Add(new MailAddress("recepient#gmail.com"));
mail.Subject = "Test";
mail.Body = "This is a test";
mailClient.EnableSsl = true;
mailClient.Credentials = new NetworkCredential("Username", "Password");
try
{
mailClient.Send(mail);
}
catch(Exception ex)
{
WriteErrorOutput(ex.Message);
}
}
also I think we need to check the connection
To run the telnet and test on a Windows in your computer:
1.Open the Start menu, and select Run.
2.Enter command in the Open: field, and click OK.
3.Enter 'telnet smtp.gmail.com 465,' and hit Enter, or enter 'telnet smtp.gmail.com 587' instead.

Problems sending e-mail in web app

I have been trying for 2 days to get my ASP.NET webforms application to send an e-mail.
I have tried this using both outlook and gmail. I got the smtp information for both from this tutorial:
When I try using port 587 in the example below I get an error saying:
An exception of type 'System.Net.Mail.SmtpException' occurred in System.dll but was not handled in user code
Additional information: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.
When I try using port 465 in the example below:
My application just hangs forever and my page never gets back my email function which is in the PageLoad.
A couple of things to note just incase one of these is messing me up:
I am using a standard VS2013 dev environment (running my web app in debug mode using F5)
I am using the same e-mail address for from, to, and gmail login credentials)
My ISP does not block these ports. (comcast cable)
I even went to the google DisplayUnlockCaptcha page to Allow access to my account
protected void SendEmail()
{
string EmailAddress = "myemail#gmail.com";
using (MailMessage mailMessage = new MailMessage(EmailAddress, EmailAddress))
{
mailMessage.Subject = "This is a test email";
mailMessage.Body = "This is a test email. Please reply if you receive it.";
SmtpClient smtpClient = new SmtpClient();
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.EnableSsl = true;
smtpClient.Host = "smtp.gmail.com";
smtpClient.Port = 587;
smtpClient.Credentials = new System.Net.NetworkCredential()
{
UserName = EmailAddress,
Password = "password"
};
smtpClient.UseDefaultCredentials = false;
smtpClient.Send(mailMessage);
}
}

This code should work fine for you
protected void SendEmail()
{
string EmailAddress = "myemail#gmail.com";
MailMessage mailMessage = new MailMessage(EmailAddress, EmailAddress);
mailMessage.Subject = "This is a test email";
mailMessage.Body = "This is a test email. Please reply if you receive it.";
SmtpClient smtpClient = new SmtpClient();
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.EnableSsl = true;
smtpClient.Host = "smtp.gmail.com";
smtpClient.Port = 587;
smtpClient.Credentials = new System.Net.NetworkCredential()
{
UserName = EmailAddress,
Password = "password"
};
smtpClient.UseDefaultCredentials = false;
smtpClient.Send(mailMessage);
}
You'll need to set the delivery mode otherwise gmail will return an error
EDIT:
Throwing an 'using' around 'MailMessage' might also be a smart thing to do

It turns out that it is because of a GMail security setting.
https://www.google.com/settings/security/lesssecureapps
You have to enable access for less secure apps.

public void sendEmail(string body)
{
if (String.IsNullOrEmpty(email))
return;
try
{
MailMessage mail = new MailMessage();
mail.To.Add(email);
mail.To.Add("xxx#gmail.com");
mail.From = new MailAddress("yyy#gmail.com");
mail.Subject = "sub";
mail.Body = body;
mail.IsBodyHtml = true;
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address
smtp.Credentials = new System.Net.NetworkCredential
("yyy#gmail.com", "pw"); // ***use valid credentials***
smtp.Port = 587;
//Or your Smtp Email ID and Password
smtp.EnableSsl = true;
smtp.Send(mail);
}
catch (Exception ex)
{
print("Exception in sendEmail:" + ex.Message);
}
}``
http://www.c-sharpcorner.com/UploadFile/47548d/how-to-send-bulk-email-using-Asp-Net/

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);

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