This article provides you to learn how to simulate and test emails in a .NET Core 7 C# console application using Papercut. This article provides a step-by-step guide to implementing email mocking with Papercut, enabling developers to efficiently test email-related functionality without relying on a live email server.

Overview

Introduction to Papercut and its Benefits

Papercut is a powerful tool designed to simplify email testing in a development environment. It functions as a local SMTP server, allowing developers to send and receive emails without relying on a live email server. With Papercut, developers can efficiently mock and validate email interactions within their .NET Core C# console applications, enabling thorough testing and ensuring the reliability of email-related functionality.

Note:

Setting up a .NET Core C# console application project

To set up a .NET Core C# console application project, follow these steps:

Alternatively, if you have an existing .NET Core C# console application project, you can skip steps 2-5 and simply open your existing project in the IDE.

Installing and configuring Papercut:

Two ways of installation

Implementation - Creating mock email interactions

1. Check with a simple email

Once the package is installed, you can use the code below to send an email:

#region Without attachment
// Email configuration
string smtpServer = "127.0.0.1"; // Papercut SMTP server address
int smtpPort = 25; // Papercut SMTP server port
string fromAddress = "[email protected]";
string toAddress = "[email protected]";
string subject = "Hello from Papercut!";
string body = "This is a test email sent from Papercut.";

// Create the email message
MailMessage mail = new MailMessage(fromAddress, toAddress, subject, body);

// Create the SMTP client
SmtpClient smtpClient = new SmtpClient(smtpServer, smtpPort);
smtpClient.EnableSsl = false;

try
{
    // Send the email
    smtpClient.Send(mail);
    Console.WriteLine("Email sent successfully!");
}
catch (Exception ex)
{
    Console.WriteLine("Failed to send email: " + ex.Message);
}
finally
{
    // Dispose of objects
    mail.Dispose();
    smtpClient.Dispose();
}
Console.ReadLine();

#endregion

2. Check email with an attachment

Here's an example of a console application in C# using .NET Core to send an email with an attachment and monitor it using Papercut:

#region With attachment
// Email details
string fromEmail = "[email protected]";
string toEmail = "[email protected]";
string subject = "Test Email with Attachment";
string body = "This is a test email with an attachment.";

// Attachment file path
string attachmentPath = @"C:\Users\Admin\Downloads\store.jpg"; //"C:\\Path\\To\\Attachment.txt";

// SMTP server configuration
string smtpServer = "127.0.0.1"; //"smtp.example.com";
int smtpPort = 25; // 587;
string smtpUsername = "your-username";
string smtpPassword = "your-password";

try
{
    // Create a new MailMessage object
    MailMessage mailMessage = new MailMessage(fromEmail, toEmail, subject, body);

    // Attach the file
    Attachment attachment = new Attachment(attachmentPath);
    mailMessage.Attachments.Add(attachment);

    // Create an SMTP client and send the email
    SmtpClient smtpClient = new SmtpClient(smtpServer, smtpPort);
    //smtpClient.Credentials = new NetworkCredential(smtpUsername, smtpPassword);
    smtpClient.EnableSsl = false;
    smtpClient.Send(mailMessage);

    Console.WriteLine("Email sent successfully.");
}
catch (Exception ex)
{
    Console.WriteLine("Error sending email: " + ex.Message);
}

Console.ReadLine();
#endregion

To monitor the emails using Papercut, follow these steps:

Note: Papercut allows you to view emails in real-time but does not deliver them to the actual recipients. It is a useful tool for testing and monitoring email sending functionality during development.

Remember to adjust and optimize the code according to your specific requirements.

Check the email in Papercut:

Papercut Integration in C# .NET Core 7 Console Apps

1. Images from Papercut desktop app

Papercut Integration in C# .NET Core 7 Console Apps

Papercut Integration in C# .NET Core 7 Console Apps

Papercut Integration in C# .NET Core 7 Console Apps

2. Images from the Papercut web app from the browser

Papercut Integration in C# .NET Core 7 Console Apps

Papercut Integration in C# .NET Core 7 Console Apps

Papercut Integration in C# .NET Core 7 Console Apps

Papercut Integration in C# .NET Core 7 Console Apps

Papercut Integration in C# .NET Core 7 Console Apps

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