How to Send an Email in C# After Configuring the Server

Introduction

This article describes how to send an email in C#. For sending the email, you need to configure the email services on the server.

Note: For more info about configuration read how to configure mail server.

To explain this article, I will use the following procedure after configuring the server:

• Create a new website and add a page into it.
• Add 3 textboxes into the page for receiver Email-ID, subject of Email and message of Email and a button for sending the mail.
• Write some code in the ".cs" file to send the mail with some text for the button's Click event.

The following are the details of the preceding procedure.

 Step 1: Create a new empty web site named "MailServer".

Step 2:  Add a new Page named "SendingMail.aspx".

• Add a Button with Onclick event (for sending the Email) on the page.

<table>
            <tr>
                <td>Mail To:-</td>
                <td>
                    <asp:TextBox ID="txtEmail" runat="server" Width="200px">
                    </asp:TextBox></td>
            </tr>
            <tr>
                <td>Subject:-</td>
                <td>
                    <asp:TextBox ID="txtSubject" runat="server" Width="200px">
                    </asp:TextBox></td>
            </tr>
            <tr>
                <td>Message:-</td>
                <td>
                    <asp:TextBox ID="txtmessagebody" runat="server" TextMode="MultiLine" Height="200px" Width="400px">
                    </asp:TextBox></td>
            </tr>
            <tr>
                <td colspan="2" align="center">
                    <asp:Button ID="btn_send" runat="server" Text="Send Mail"
                        OnClick="btn_send_Click" /></td>
            </tr>
        </table>

• Add the 3 namespaces on top of the ".cs" file.

using System.Net.Mail;
using System.IO;
using System.Text;

• Write the code to sending the email on the click event of the button.

   protected void btn_send_Click(object sender, EventArgs e)
    {
        try
        {
            MailMessage message = new MailMessage();
            message.To.Add(txtEmail.Text);// Email-ID of Receiver
            message.Subject = txtSubject.Text;// Subject of Email
// Email-ID of Sender
            message.From = new System.Net.Mail.MailAddress("[email protected]");
            message.Body = txtmessagebody.Text;// body of Email
            SmtpClient SmtpMail = new SmtpClient();
//name or IP-Address of Host used for SMTP transactions
            SmtpMail.Host = "Your Host";
            SmtpMail.Port = 25;//Port for sending the mail
//username/password of network, if apply
            SmtpMail.Credentials = new System.Net.NetworkCredential("", "");
            SmtpMail.DeliveryMethod = SmtpDeliveryMethod.Network;
            SmtpMail.EnableSsl = false;
            SmtpMail.ServicePoint.MaxIdleTime = 0;
            SmtpMail.ServicePoint.SetTcpKeepAlive(true, 2000, 2000);
            message.BodyEncoding = Encoding.Default;
            message.Priority = MailPriority.High;
            message.IsBodyHtml = true;
            SmtpMail.Send(message); //Smtpclient to send the mail message
            Response.Write("Email has been sent");
        }
        catch (Exception ex)
        { Response.Write("Failed"); }
    }

Note: the "SmtpMail.Host" value will be your hosting name or IP Address and "SmtpMail.Port" will also vary.

Step 3:  Run the page in the server that will be like:

• After filling in the valid Email ID, Subject of Email and message of Email, click on the "Send mail" button to send the email.

Result: Now you can see that, I (the receiver) got the email.