اتصال به ایمیل‌سرور در برنامه‌های NET.

MAIL_HOST=smtp.c1.liara.email
MAIL_PORT=587
MAIL_USER=hopeful_zhukovsky_9daqpv
MAIL_PASSWORD=fbef30d7-f852-428e-9573-bc73381c7d4d
MAIL_FROM_ADDRESS=info@example.com

using System.Net;
using System.Net.Mail;
using dotenv.net;

DotEnv.Load(); // Load the environment variables from .env file

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.MapGet("/send-test-email", async context =>
{
    // Read SMTP settings from environment variables
    var smtpHost = Environment.GetEnvironmentVariable("MAIL_HOST");
    int smtpPort = int.Parse(Environment.GetEnvironmentVariable("MAIL_PORT") ?? "587");
    var smtpUser = Environment.GetEnvironmentVariable("MAIL_USER");
    var smtpPassword = Environment.GetEnvironmentVariable("MAIL_PASSWORD");
    var fromAddress = Environment.GetEnvironmentVariable("MAIL_FROM_ADDRESS") ?? "info@example.com";
    var toAddress = "recipient@example.com"; // Replace with recipient's email address

    // Create a new SmtpClient
    using (var smtpClient = new SmtpClient(smtpHost, smtpPort))
    {
        smtpClient.EnableSsl = true; // Use TLS encryption
        smtpClient.Credentials = new NetworkCredential(smtpUser, smtpPassword);

        // Create the email message
        var mailMessage = new MailMessage(fromAddress, toAddress)
        {
            Subject = "Test Email",
            Body = "<h2>This is a test email sent from a .NET Core application using SMTP<h2>",
            IsBodyHtml = true
        };

        // Add custom headers
        mailMessage.Headers.Add("x-liara-tag", "test-tag");

        // Send the email
        try
        {
            await smtpClient.SendMailAsync(mailMessage);
            await context.Response.WriteAsync("Test email sent successfully!");
        }
        catch (Exception ex)
        {
            await context.Response.WriteAsync($"Failed to send email: {ex.Message}");
        }
    }
});

app.Run();

using MimeKit;
using MailKit.Net.Smtp;
using DotNetEnv; // for install this, run: dotnet install add package DotNetEnv

namespace your_project_name.Controllers; 

public class TestController : Controller
{
    [HttpPost]
    public IActionResult SendEmail(string email)
    {   
        // Email Information  
        Env.Load();
        string senderName  = Env.GetString("SENDER_NAME");
        string senderEmail = Env.GetString("SENDER_ADDRESS");
        string subject     = Env.GetString("EMAIL_SUBJECT");
        string body        = Env.GetString("EMAIL_BODY");

        // Email Instance
        var message = new MimeMessage();
        message.From.Add(new MailboxAddress(senderName, senderEmail));
        message.To.Add(new MailboxAddress("Recipient", email));
        message.Subject = subject;

        // Creating The Body 
        message.Body = new TextPart("plain")
        {
            Text = body
        };

        try
        {
            // Sending Email 
            using (var client = new SmtpClient())
            {
                client.Connect(Env.GetString("MAIL_HOST"), Env.GetInt("MAIL_PORT"), false);
                client.Authenticate(Env.GetString("MAIL_USERNAME"), Env.GetString("MAIL_PASSWORD"));
                client.Send(message);
                client.Disconnect(true);
            }

            ViewBag.Message = "Email Sent Successfully.";
        }
        catch (Exception ex)
        {
            ViewBag.Message = $"Error In Sending Email: {ex.Message}";
        }


        return RedirectToAction("Index");
    }

}