Asp.net sending email

Question

How can I send an activation email when new users register in my website using asp.net c#? I have tried the steps described this link but I have faced this error:

System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed.

Is there any solution to this or any other way to send an email?

this is my code

using (MailMessage mm = new MailMessage("[email protected]", txtEmail.Text))
{
    mm.Subject = "Account Activation";
    string body = "Hello " + txtUsername.Text.Trim() + ",";
    body += "<br /><br />Please click the following link to activate your account";
    body += "<br /><a href = '" + Request.Url.AbsoluteUri.Replace("CS.aspx", "CS_Activation.aspx?ActivationCode=" + activationCode) + "'>Click here to activate your account.</a>";
    body += "<br /><br />Thanks";
    mm.Body = body;
    mm.IsBodyHtml = true;
    SmtpClient smtp = new SmtpClient();
    smtp.Host = "smtp.gmail.com";
    smtp.EnableSsl = true;
    NetworkCredential NetworkCred = new NetworkCredential("[email protected]", "<password>");
    smtp.UseDefaultCredentials = true;
    smtp.Credentials = NetworkCred;
    smtp.Port = 587;
    smtp.Send(mm);
}

The proposed duplicate did not solve the problem. I am already using port 587.

1) You need to show some code. 2) You need to talk to an ACTUAL EMAIL SERVER, and the server needs to be able to accept connections from you. Based in this error net_io_connectionclosed, it sounds like that's NOT happening. — paulsm4
– paulsm4, Commented May 18, 2016 at 18:28
Look at this link for detals on your "net_io_connectionclosed" error: SmtpException: Unable to read data from the transport connection: net_io_connectionclosed — paulsm4
– paulsm4, Commented May 18, 2016 at 18:29
i have edited the post please have a look were is the wrong?? @paulsm4 — Bayan
– Bayan, Commented May 19, 2016 at 16:04
Your code is not necessarily the problem E-mail servers can be very picky about who they'll talk to, and how they'll talk to you. Juan Pablo Melgarejo's response bypasses the problem by using Google's e-mail server, smtp.gmail.com, SUGGESTIONS: 1) Contact your e-mail administrator. Make sure your settings are correct; review his e-mail logs for errors. 2) Try Google e-mail: emailarchitect.net/easendmail/kb/csharp.aspx?cat=2 — paulsm4
– paulsm4, Commented May 19, 2016 at 17:36
smtp.UseDefaultCredentials = true; should be smtp.UseDefaultCredentials = false; - because you just gave it non-default credentials — Rob
– Rob ♦, Commented May 20, 2016 at 1:46

Riad Baghbanli · Accepted Answer · 2016-05-18 18:26:19Z

See the code below:

public static class email_utility
{
    public static async Task<bool> send_email(this string body, string subject, string email, int try_count)
    {
        return await Task.Run(() =>
        {
            var cli = new SmtpClient();
            using (var message = new MailMessage(config.sender_email, email))
            {
                message.Subject = subject;
                message.SubjectEncoding = UTF8Encoding.UTF8;
                message.Body = body;
                message.BodyEncoding = UTF8Encoding.UTF8;
                message.DeliveryNotificationOptions = DeliveryNotificationOptions.Never;
                for (var count = 0; count < try_count; ++count)
                {
                    try
                    {
                        lock (config.sender_email)
                        {
                            cli.Send(message);
                            return true;
                        }
                    }
                    catch (SmtpFailedRecipientsException)
                    {
                        return false;
                    }
                    catch (SmtpException)
                    {
                        Thread.Sleep(config.send_timeout);
                    }
                }
                return false;
            }
        });
    }
}

Juan Pablo Melgarejo · Accepted Answer · 2016-05-18 18:31:29Z

1

Try this, it works perfectly and you only have to change the fields that are before the var smtp = newSMTPCient.

using System.Net;
using System.Net.Mail;

var fromAddress = new MailAddress("[email protected]", "From Name");
var toAddress = new MailAddress("[email protected]", "To Name");
const string fromPassword = "fromPassword";
const string subject = "Subject";
const string body = "Body";

var smtp = new SmtpClient
           {
               Host = "smtp.gmail.com",
               Port = 587,
               EnableSsl = true,
               DeliveryMethod = SmtpDeliveryMethod.Network,
               UseDefaultCredentials = false,
               Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
           };
using (var message = new MailMessage(fromAddress, toAddress)
                     {
                         Subject = subject,
                         Body = body
                     })
{
    smtp.Send(message);
}

answered May 18, 2016 at 18:31

Juan Pablo Melgarejo

451 silver badge7 bronze badges

1 Comment

paulsm4 Over a year ago

FYI, the reason it's working perfectly for you (besides the fact that your code is correct!) is 1) you're using GMail as an e-mail relay, 2) you happen t have a valid gmail account, which you specified in your "From" address, 3) You're using port 587 and TLS encrypted SMTP. The first thing the OP needs to do is work with his network administrator and look at possible configuration/permissions issues with their "preferred" e-mail server.

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