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Home Interviews How do you send an email using SmtpClient in C#? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 30 May 2025
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To send an email using SmtpClient in C#, you typically need:

  1. The SMTP server address and port
  2. A sender and recipient email address
  3. Credentials if the SMTP server requires authentication

Basic Example: Sending an Email with SmtpClient

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

class Program
{
    static void Main()
    {
        var fromAddress = new MailAddress("your-email@example.com", "Your Name");
        var toAddress = new MailAddress("recipient@example.com", "Recipient Name");
        const string subject = "Test Email";
        const string body = "This is a test email sent from C#.";

        var smtp = new SmtpClient
        {
            Host = "smtp.example.com", // e.g., smtp.gmail.com
            Port = 587, // Or 465 for SSL
            EnableSsl = true,
            DeliveryMethod = SmtpDeliveryMethod.Network,
            UseDefaultCredentials = false,
            Credentials = new NetworkCredential("your-email@example.com", "your-email-password")
        };

        using (var message = new MailMessage(fromAddress, toAddress)
        {
            Subject = subject,
            Body = body
        })
        {
            smtp.Send(message);
        }
    }
}

Security Note (especially for Gmail and others):

  1. If you're using Gmail or similar services:
  2. Enable App Passwords if 2FA is on.
  3. Use smtp.gmail.com with port 587 (TLS) or 465 (SSL).
  4. Avoid hardcoding credentials—use a secure store or environment variables.

Async Version

Use this in modern apps (e.g., ASP.NET MVC, WPF):

await smtp.SendMailAsync(message);
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