Here I will explain how to send Emails using the Background process using Core MVC.

Create Core Web APP(Model-View-Controller)

First, create a new project from Visual Studio and name it as CoreMailSend and input the other details.

Create new MVC project
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Update your bootstrap to the latest by visiting the Bootstrap 5 site and go to Views -> Shared -> Layout.cshtml and change the bootstrap CSS and js file.

Bootstrap link in Layout.cshtml

Create a Email Send Form on Index.cshtml

Open the Views -> Home -> index.cshtml and edit the below code

<div class="row g-5">
    <h4 class="mb-3">Send Email</h4>
    <form method="post" asp-controller="Home" asp-action="Index">
        <div class="row g-3">
            <div class="col-12">
                <input class="form-control" type="text" name="to" placeholder="Send to" required />
            <div class="col-12">
                <input class="form-control" type="text" name="subject" placeholder="Subject" required />
            <div class="col-12">
                <textarea class="form-control" type="text" name="body" placeholder="Message" required></textarea>
            <div class="col-12">
                <input type="submit" value="Submit"/>
            <div class="form-group">
                <div class="text-success">
                    @if(TempData["alert"] != null)

Create Sendmail class to add Mail Configurations

Right click on the solution and Add -> Class to create a new class and name it as Sendmail.cs and add the following code

public static void Email(string to, string subject, string body)
            MailMessage mm = new();
            mm.To.Add(new MailAddress(to));
            mm.From = new MailAddress("Your Email Address");
            mm.Subject = subject;
            mm.Body = body;
            mm.IsBodyHtml = true;
            mm.Priority = MailPriority.High;
            SmtpClient smtpClient = new();
            smtpClient.Host = "";
            smtpClient.Port = 587;
            smtpClient.EnableSsl = true;
            smtpClient.Credentials = new NetworkCredential("Your Email Address", "Password");
            smtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;

Add Post Method in HomeController

Now go to Controllers -> HomeController and add the below code

        public IActionResult Index(string to,string subject,string body)
                Thread email = new(delegate ()
                    Sendmail.Email(to, subject, body);
                email.IsBackground = true;
                TempData["alert"] = "Email Successfully Sent";
            catch (Exception)
                TempData["alert"] = "Problem Sending mail. Please check the configuration";
            return Redirect("Home/Index");

Now run the Application

Run the application to see the design

Application Running

Output of the application

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