Sending mail from ASP.NET / C#

SMTP Authentication Requirement

It is mandatory to use SMTP authentication when sending emails through our servers. Below is a sample C# code snippet demonstrating how to implement SMTP authentication. You can modify it as needed for your specific setup.

C# Code for Sending Emails with SMTP Authentication

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

class Program
{
    static void Main()
    {
        SmtpClient smtpClient = new SmtpClient();
        MailMessage message = new MailMessage();

        // Sender Email Address & Display Name
        MailAddress fromAddress = new MailAddress("from@from.com", "From Name");
        
        // SMTP Server Hostname or IP Address
        smtpClient.Host = "mail.yoursite.com"; // Alternatively, use mail server IP
        
        // SMTP Port (Default: 25)
        smtpClient.Port = 25;

        // SMTP Authentication Credentials
        NetworkCredential info = new NetworkCredential("smtpuser@yoursite.com", "smtp-password");
        smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
        smtpClient.UseDefaultCredentials = false;
        smtpClient.Credentials = info;

        // Assign Sender Address
        message.From = fromAddress;

        // Recipient Address
        message.To.Add("to@domain2.com");

        // Email Subject
        message.Subject = "Your subject";

        // Optional: CC & BCC (Uncomment to use)
        // message.CC.Add("cc@domain.com");
        // message.Bcc.Add("bcc@domain.com");

        // Define Email Body Format (true for HTML, false for plain text)
        message.IsBodyHtml = false;
        
        // Email Body Content
        message.Body = "Body of email is here";

        // Send Email
        smtpClient.Send(message);
    }
}

Notes:

• Update smtpClient.Host with your mail server's hostname or IP.

• Replace "smtpuser@yoursite.com" and "smtp-password" with valid SMTP credentials.

• Modify "from@from.com", "to@domain2.com", and the subject/body as needed.

• If using a different SMTP port (e.g., 587 for TLS or 465 for SSL), update smtpClient.Port accordingly.

By implementing this authentication method, you ensure that emails sent through our servers are properly authenticated and delivered securely.