To integrate Papercut SMTP with a C# application system, follow these steps:

1. Download Papercut SMTP: Download and install Papercut SMTP from the official Papercut website.
2. Configuration: Configure Papercut SMTP by setting the SMTP host and port in your application's settings. Typically, the default port is 25 or 2525.
3. Modify SMTP Settings in C#: Adjust your application's SMTP settings to point to Papercut SMTP. Here's an example of how to do this:

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

public void ConfigureSmtpClient()
{
    // Set up the SMTP client using Papercut SMTP server
    SmtpClient smtpClient = new SmtpClient("localhost", 25)
    {
        Credentials = new NetworkCredential("username", "password"), // Credentials are optional
        EnableSsl = false // Papercut doesn't support SSL connections
    };

    // Create a new email message
    MailMessage mailMessage = new MailMessage
    {
        From = new MailAddress("test@example.com"),
        Subject = "Test Email",
        Body = "This is a test email sent using Papercut SMTP.",
        IsBodyHtml = true,
    };

    // Add a recipient to the email
    mailMessage.To.Add("recipient@example.com");

    // Send the email
    smtpClient.Send(mailMessage);
    System.Console.WriteLine("Message sent successfully");
}

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

public void ConfigureSmtpClient()
{
    // Set up the SMTP client using Papercut SMTP server
    SmtpClient smtpClient = new SmtpClient("localhost", 25)
    {
        Credentials = new NetworkCredential("username", "password"), // Credentials are optional
        EnableSsl = false // Papercut doesn't support SSL connections
    };

    // Create a new email message
    MailMessage mailMessage = new MailMessage
    {
        From = new MailAddress("test@example.com"),
        Subject = "Test Email",
        Body = "This is a test email sent using Papercut SMTP.",
        IsBodyHtml = true,
    };

    // Add a recipient to the email
    mailMessage.To.Add("recipient@example.com");

    // Send the email
    smtpClient.Send(mailMessage);
    System.Console.WriteLine("Message sent successfully");
}

Output

Combining IronPDF with Papercut SMTP can be very effective, especially for generating and sending PDF reports or documents via email during app development. Below is an example of how to use IronPDF to generate a PDF and send it using Papercut SMTP.

Step-by-Step Example

1. Generate PDF Using IronPDF: Create a PDF document with IronPDF.
2. Send Generated PDF via Papercut SMTP: Use Papercut SMTP to send the generated PDF as an email attachment.

Full Example Combining Both Steps

Here is a full example combining PDF generation code and sending it via email using Papercut SMTP:

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

public class EmailPdfSender
{
    public void GenerateAndSendPdfEmail()
    {
        // Generate PDF
        var Renderer = new ChromePdfRenderer();
        var PDF = Renderer.RenderHtmlAsPdf("<h1>Hello World</h1><p>This is a test PDF generated by IronPDF to send as an attachment with mail using SMTP.</p>");
        string pdfPath = "test.pdf";
        PDF.SaveAs(pdfPath);
        System.Console.WriteLine("PDF Created");

        // Configure SMTP Client for Papercut
        SmtpClient smtpClient = new SmtpClient("localhost", 25)
        {
            Credentials = new NetworkCredential("username", "password"), // Credentials are optional
            EnableSsl = false // Papercut doesn't support SSL connections
        };

        // Create Mail Message
        MailMessage mailMessage = new MailMessage
        {
            From = new MailAddress("test@example.com"),
            Subject = "Test PDF Email",
            Body = "Please find the attached PDF document.",
            IsBodyHtml = true,
        };
        mailMessage.To.Add("recipient@example.com");

        // Attach PDF
        Attachment attachment = new Attachment(pdfPath);
        mailMessage.Attachments.Add(attachment);

        // Send Email
        smtpClient.Send(mailMessage);
        System.Console.WriteLine("Message sent successfully with Attachment");
    }
}

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

public class EmailPdfSender
{
    public void GenerateAndSendPdfEmail()
    {
        // Generate PDF
        var Renderer = new ChromePdfRenderer();
        var PDF = Renderer.RenderHtmlAsPdf("<h1>Hello World</h1><p>This is a test PDF generated by IronPDF to send as an attachment with mail using SMTP.</p>");
        string pdfPath = "test.pdf";
        PDF.SaveAs(pdfPath);
        System.Console.WriteLine("PDF Created");

        // Configure SMTP Client for Papercut
        SmtpClient smtpClient = new SmtpClient("localhost", 25)
        {
            Credentials = new NetworkCredential("username", "password"), // Credentials are optional
            EnableSsl = false // Papercut doesn't support SSL connections
        };

        // Create Mail Message
        MailMessage mailMessage = new MailMessage
        {
            From = new MailAddress("test@example.com"),
            Subject = "Test PDF Email",
            Body = "Please find the attached PDF document.",
            IsBodyHtml = true,
        };
        mailMessage.To.Add("recipient@example.com");

        // Attach PDF
        Attachment attachment = new Attachment(pdfPath);
        mailMessage.Attachments.Add(attachment);

        // Send Email
        smtpClient.Send(mailMessage);
        System.Console.WriteLine("Message sent successfully with Attachment");
    }
}

Console Output

Attachment