Clivelancaster/Controllers/ContactController.cs

using Microsoft.AspNetCore.Mvc;
using System.Net;
using clivelancaster.Models;
using MailKit.Net.Smtp;
using MimeKit;

namespace clivelancaster.Controllers
{
    public class ContactController : Controller
    {
        public IActionResult Index()
        {
            return View();
        }
        private readonly IConfiguration _configuration;

        public ContactController(IConfiguration configuration)
        {
            _configuration = configuration;
        }
        [HttpPost]
        public async Task<IActionResult> Index(ContactFormModel model)
        {
            if (ModelState.IsValid)
            {
                // Build the email message
                var message = new MimeMessage();
                message.From.Add(new MailboxAddress("Clive", "clivelancaster@gmail.com"));
                message.To.Add(new MailboxAddress("Clive", "clivelancaster@gmail.com"));
                message.Subject = "Website: Contact Form - clivelancaster.com";

                var bodyBuilder = new BodyBuilder
                {
                    TextBody = $"Name: {model.Name}\nEmail: {model.Email}\n\nSubject: {model.Subject}\n\nMessage:\n{model.Message}"
                };

                message.Body = bodyBuilder.ToMessageBody();

                try
                {
                    using (var client = new SmtpClient())
                    {
                        // Retrieve SMTP settings from appsettings.json
                        var smtpHost = _configuration["SmtpSettings:Host"];
                        int smtpPort = int.Parse(s: _configuration["SmtpSettings:Port"]);
                        var smtpUsername = _configuration["SmtpSettings:Username"];
                        var smtpPassword = _configuration["SmtpSettings:Password"];

                        client.Connect(smtpHost, smtpPort, true);
                        client.Authenticate(smtpUsername, smtpPassword);
                        await client.SendAsync(message);
                        client.Disconnect(true);
                    }

                    ViewBag.Message = "Message sent successfully!";
                }
                catch
                {
                    ViewBag.Message = "Error sending message.";
                }

                return View();
            }

            return View(model);
        }
    }
}