I am developing a program which needs to have the capability to send emails. I've got a simple mail function setup however I have never really delved into the mail side of things and am not sure if I'm using the correct settings.
I am sure I am doing something wrong with the SMTP, I have set the MailMessage host as the outgoing mail server that I use for emailing from outlook (the email accounts are hosted on shared virtual hosting so I use their supplied hostname in the function) alongside the login credentials I would normally use. When I try to send a test email it throws an unable to connect to remote server exception. I have WAMPSERVER setup on the computer I am trying to run this from, I know it has some kind of SMTP capability? Should I be using this or is there no reason I can't use shared virtual hosting SMTP as the host? Please refer to code below-
public void EmailTracking()
{
string to = "johnsmith#xxxxxxxxxxxxx.com.au";
string body = "this is some text for body";
string subject = "subject line";
string fromAddress = "kelvie#xxxxxxxxxx.com.au";
string fromDisplay = "Kelvie";
string credentialUser = "removed";
string credentialPassword = "removed";
string host = "removed";
MailMessage mail = new MailMessage();
mail.Body = body;
mail.IsBodyHtml = true;
mail.To.Add(new MailAddress(to));
mail.From = new MailAddress(fromAddress, fromDisplay, Encoding.UTF8);
mail.Subject = subject;
mail.SubjectEncoding = Encoding.UTF8;
mail.Priority = MailPriority.Normal;
SmtpClient smtp = new SmtpClient();
smtp.Credentials = new System.Net.NetworkCredential(credentialUser, credentialPassword);
smtp.Host = host;
smtp.Send(mail); //fails here with unable to connect to remote server
}
Related
Our application has the possibility to send emails via SmtpClient. One of our customer is trying to do so by using his gmail account and it fails resulting in a timeout. However, from our testing lab it works just fine (with another gmail account).
In the trace i can see that the server is not answering with Certificate, Server Key Exchange, Server Hello Done. And im wondering what can be the cause for this?
I also noticed in the traces, the customer is using TLSv1 so I tried to replicate the error on a Windows7 system but still it works for me.
oSmtp = new SmtpClient(this.host, this.port);
oSmtp.DeliveryMethod = SmtpDeliveryMethod.Network;
oSmtp.EnableSsl = ssl;
NetworkCredential oCredential = new NetworkCredential(this.userName, this.password);
oSmtp.Credentials = oCredential;
oSmtp.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);
string userState = null;
oSmtp.SendAsync(oMsg, userState);
As far as the code goes, enableSsl is true, the port is 587 and we also instructed our customer to check his gmail account and allow less secure applications.
We will ask the customer for more specific details and try to put more traces in our application, but i would like to know if there is anything that can prevent the server to answer with Certificate,...
Inspecting the traces revealed no significant difference between customers Client Hello and our test Client Hello.
Thanks!
This is a working sample i used few days ago:
string fromAddress = "fromaddress#gmail.com";
var toAddress = new MailAddress("fake#email.com", "To person");
const string fromPassword = "pass";
const string subject = "test";
const string body = "Hey now!!";
using (MailMessage mail = new MailMessage())
{
mail.From = new MailAddress(fromAddress);
mail.To.Add(toAddress);
mail.Subject = subject;
mail.Body = body;
mail.IsBodyHtml = true;
//mail.Attachments.Add(new Attachment("C:\\file.zip"));
using (SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587))
{
smtp.UseDefaultCredentials = false;
smtp.Credentials = new NetworkCredential(fromAddress, fromPassword);
smtp.EnableSsl = true;
smtp.Send(mail);
}
}
also make sure to enable Less secure app access for the gmail you are using to send data:
I'm developing a third-party add-on to run in a program called M-Files.
The purpose of the add-on is to send a mail with the help of an SMTP server. I created a fake SMTP server in DevelMail.com just for testing.
Testing the SMTP server from a browser works but when i run the code it gives me the following error.
Transaction failed. The server response was: 5.7.1 Client host rejected: Access denied
Here are the SMTP information:
Host: smtp.develmail.com
SMTP Port: 25
TLS/SSL Port: 465
STARTTLS Port : 587
Auth types: LOGIN, CRAM-MD5
Here is the code:
MailAddress adressFrom = new MailAddress("notification#mfiles.no", "M-Files Notification Add-on");
MailAddress adressTo = new MailAddress("majdnakhleh#live.no");
MailMessage message = new MailMessage(adressFrom, adressTo);
message.Subject = "M-Files Add-on running";
string htmlString = #"<html>
<body>
<p> Dear customer</p>
<p> This is a notification sent to you by using a mailadress written in a metadata property!.</p>
<p> Sincerely,<br>- M-Files</br></p>
</body>
</html>
";
message.Body = htmlString;
SmtpClient client = new SmtpClient();
client.Host = "smtp.develmail.com";
client.Port = 587;
client.Credentials = new System.Net.NetworkCredential("myUserName", "myPassword");
client.EnableSsl = true;
client.Send(message);
Reason for the Issue:
Usually, email sending option using SMTP encountered Access denied
because there should have a sender email which required to allow
remote access. When SMTP request sent from the sender email
it checks whether there is remote access allowed. If no, then you
always got Access denied message.
Solution:
For example let's say, you want to send email using Gmail SMTP in that case you do have to enable Allow less secure apps: ON
How To Set
You can simply browse this link Less secure app access and turn that to ON
See the screen shot
Code Snippet:
public static object SendMail(string fromEmail, string toEmail, string mailSubject, string mailBody, string senderName, string senderPass, string attacmmentLocationPath)
{
try
{
MailMessage mail = new MailMessage();
//Must be change before using other than gmail smtp
SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
mail.From = new MailAddress(fromEmail);
mail.To.Add(toEmail);
mail.Subject = mailSubject;
mail.Body = mailBody;
mail.IsBodyHtml = true;
SmtpServer.Port = 587;
SmtpServer.Credentials = new System.Net.NetworkCredential(senderName, senderPass);//Enter the credentails from you have configured earlier
SmtpServer.EnableSsl = true;
SmtpServer.Send(mail);
return true;
}
catch (Exception ex)
{
return ex;
}
}
Note: Make sure, fromEmail and (senderName, senderPass) should be same email with the credential.
Hope that would help.
I am using MVC framework 4.5 C# and publish the my project on Windows server 2012 R2. In that server when I tried to sending mail with gmail but its can not send the mail and giving the below description.
The SMTP server requires a secure connection or the client was not
authenticated.The server response was: 5.5.1 Authentication Required.
I installed SMTP Service and all configuration regarding that.
Same mail configuration is running my development server.
It is due to security check on gmail so please follow below steps.
Log in to production server via remote access, and sign in to gmail once with your credentials. They will ask for the confirmation, confirm it
SmtpClient client = new SmtpClient("smtp.gmail.com");
client.Credentials = new System.Net.NetworkCredential("your email address", "password");
client.Port = 587;
client.EnableSsl = true;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
// Specify the email sender.
// Create a mailing address that includes a UTF8 character
// in the display name.
MailAddress from = new MailAddress("your email address");
// Set destinations for the email message.
MailAddress to = new MailAddress(textBox_SedToEmail.Text);
// Specify the message content.
MailMessage message = new MailMessage(from, to);
message.Body = "This is a test email message sent by an application. ";
// Include some non-ASCII characters in body and subject.
string someArrows = new string(new char[] { '\u2190', '\u2191', '\u2192', '\u2193' });
message.Body += Environment.NewLine + someArrows;
message.BodyEncoding = System.Text.Encoding.UTF8;
message.Subject = "test message 1" + someArrows;
message.SubjectEncoding = System.Text.Encoding.UTF8;
message.Attachments.Add(new Attachment(#"C:\Users\eddie\Pictures\2.jpg"));
// Set the method that is called back when the send operation ends.
client.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);
// The userState can be any object that allows your callback
// method to identify this send operation.
// For this example, the userToken is a string constant.
string userState = "test message1";
client.SendAsync(message, userState);
I am trying to send email in a .NET console application. I have an SMTP server with i.P. address X.X.X.X (sanitized to protect the innocent).
The SMTP server has been set up (the relay configured) to allow email from the server that is hosting the .NET console app, and send that email to the outside world.
I have tested this with telnet from the server hosting the console app. I successfully sent an email with telnet console from the server hosting the console app using the SMTP server's I.P. address. There is no authentication required when using telnet. I have not been given any connection credentials.
But when I try to do it in the .NET app, I get the following error:
Syntaz error, command unrecognized. The server response was: : Helo command rejected: need fully-qualified hostname
Here is my code:
string mailMessagetest = "test";
string subjecttest = "test";
List<string> recipienttest = new List<string>();
recipienttest.Add("me#mydomain.com");
utility.SendMail(recipienttest, subjecttest, mailMessagetest);
Here is the function SendMail:
public static void SendMail(List<string> recipient, string subject, string message)
{
MailMessage mailMessage = new MailMessage();
mailMessage.From = new MailAddress("myfriend#mydomain.com");
foreach (string to in recipient)
{
mailMessage.To.Add(to);
}
mailMessage.Subject = subject;
mailMessage.Body = message;
SmtpClient client = new SmtpClient();
client.Host = "X.X.X.X";
client.Port = 25;
client.Send(mailMessage);
}
Change the hostname from an IP address to its name, e.g. "smtp.provider.com" or if its internal "mailserver.domain".
UPDATE:
Try read this system.net.mail.smtpclient fqdn required and this the FQDN is not sent when you send a HELO or EHLO.
Create a user with password on your SMTP server then apply the following settings:
smtp.UseDefaultCredentials = false;
smtp.Credentials = new NetworkCredential("user", "pass");
smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
smtp.Port = 25;
smtp.EnableSsl = true; // or false depending your server
I have the following code but I am getting an exception that a smtp host is not defined. If I am running this and testing on my local machine from visual studio, what do I need to do to be able to send email from my machine. Do I have to turn on some Windows service?
private void SendMailToAdminToApprove(string email_, string name_)
{
MailMessage msg = new MailMessage();
msg.From = new MailAddress("address#domain.com", "Person's Name");
msg.To.Add(new MailAddress("a#gmail.com", "Adam"));
msg.Subject = "Message Subject";
msg.Body = "Mail body content";
msg.IsBodyHtml = true;
msg.Priority = MailPriority.High;
try
{
SmtpClient c = new SmtpClient();
c.Send(msg);
}
catch (Exception ex)
{
Console.Write("T");
}
}
You need to set the SMTP host to point to an actual SMTP server. One option is to run the SMTP service on your own machine, but you could also point to your ISP's server.
edit
As pcampbell and Skeolan mentioned, the actual value should go into app.config. I'm not sure if localhost would be an exception: it would depend on whether you want the option of not running a local server.
You'll need to specify the SMTP host here:
string smtpHost = "localhost";
//or go to your config file
smtpHost = ConfigurationManager.AppSettings["MySmtpHost"].ToString();
SmtpClient c = new SmtpClient(smtpHost);
You need to define the SMTP relay:
SmtpClient c = new SmtpClient("relay.yourdomain.com");
or if you're running the relay locally:
SmtpClient c = new SmtpClient("localhost");
You should change this section:
SmtpClient c = new SmtpClient();
// Either specify a SMTP server above, or set c.Host
c.Send(msg);
You need to specify which SMTP server is going to be used for sending this message. If you install a SMTP server locally, this could be localhost - but otherwise, you'll need to have an outgoing mail server set appropriately.
Here is the code I use for sending email with C#. I also commented out code for sending it to a file locally if you need it.
SmtpClient smtp = new SmtpClient(smtpServer, portNumber);
// Disable SSL when saving to directory.
smtp.EnableSsl = true;
smtp.Credentials = new NetworkCredential(mailFrom, password);
// Set mail to be delivered to a folder
//smtp.PickupDirectoryLocation = #"C:\mail\Send";
//smtp.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;