What is MailKit and how does it integrate with .NET applications?

MailKit is an open-source email framework that supports sending and receiving emails in .NET applications using SMTP and IMAP protocols. It enables developers to interact with mail servers, send HTML emails, and manage security settings.

How can I install MailKit in my C# project?

To install MailKit, open your C# project in Visual Studio, navigate to the Solution Explorer, right-click on your project, select 'Manage NuGet Packages', search for 'MailKit', and install it.

How do I configure MailKit to send emails?

To configure MailKit for sending emails, you need to set up an SMTP server in your application by obtaining the server address, port number, and authentication details from your chosen email service, such as Gmail.

Can MailKit handle HTML emails and attachments?

Yes, MailKit supports advanced features such as handling HTML emails and attachments, allowing you to build rich email content and manage attachments seamlessly.

What are the benefits of using IronPDF with MailKit?

Integrating IronPDF with MailKit allows you to convert email content into PDF documents, offering a way to archive and share email communications in a universally accessible format.

How can I install IronPDF in my .NET project?

You can install IronPDF via the NuGet Package Manager in Visual Studio by searching for 'IronPDF' and installing it, or by downloading the DLL file directly from IronPDF's website and adding it to Visual Studio.

What functionalities does IronPDF provide for PDF management?

IronPDF provides functionalities for generating, rendering, and manipulating PDF documents within .NET applications. It simplifies converting HTML templates to PDFs and creating complex documents.

Is IronPDF free to use for development purposes?

Yes, IronPDF is free to use for development purposes, and there is a 30-day free trial available. It's also part of the Iron Software Suite, which offers various licensing options for broader use.

What are the steps to create a complete email application using MailKit?

To build a complete email application using MailKit, you need to create a user interface, integrate MailKit's functionalities (SMTP, IMAP, etc.), facilitate user interactions, and thoroughly test the application before deployment.

How can HTML templates enhance email content in MailKit?

HTML templates allow for dynamic and visually appealing email content, which can be more engaging for recipients. Templates can be loaded from external files or embedded resources, providing flexibility in content management.

The C# PDF Library

Explore IronPDF Start Free Trial

HTML to PDF

Online Demo See All Code Examples

using IronPdf;

// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;

// Instantiate Renderer
var renderer = new ChromePdfRenderer();

// Create a PDF from a HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");

// Export to a file or Stream
pdf.SaveAs("output.pdf");

// Advanced Example with HTML Assets
// Load external html assets: Images, CSS and JavaScript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");

using IronPdf;

// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;

// Instantiate Renderer
var renderer = new ChromePdfRenderer();

// Create a PDF from a HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");

// Export to a file or Stream
pdf.SaveAs("output.pdf");

// Advanced Example with HTML Assets
// Load external html assets: Images, CSS and JavaScript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");

PM >Install-Package IronPdf

Install-Package IronPdf

.NET HELP

Mailkit C# (How it Works For Developers)

Jacob Mellor

Updated: April 21, 2026

How to Use MailKit

For any business looking to level up their marketing, MailKit is a comprehensive and powerful tool for managing email and SMS communications. For example, MailKit allows you to build templates and automate email generation from a chosen data source, meaning you can send frequent, updated emails without having to manually build or send your messages.

In this guide, we'll show you how to install and get started with using MailKit, as well as how to integrate it with IronPDF to create a powerful email and PDF-generation program.

What is MailKit?

MailKit is an open-source project which has become an essential tool in .NET app development. It's a comprehensive email framework which supports sending and receiving emails through SMTP and IMAP protocols. It enables developers to interact with mail servers easily, send HTML emails, and manage security settings, proving crucial for .NET applications requiring email functionalities.

IronPDF allows for generating, rendering, and manipulating PDF documents within .NET apps. It simplifies converting HTML templates to PDFs and creating intricate documents, making it an ideal tool for managing PDFs with web-based data.

Getting Started with MailKit

Installing MailKit in Your Project

To start using MailKit in your application, you need to install the MailKit package. This can be done via MailKit on NuGet, a package manager for .NET. Here's how you can do it:

Open your C# project in Visual Studio
Navigate to the Solution Explorer, right-click on your project, and select Manage NuGet Packages
Search for 'MailKit' in the NuGet Package Manager and install it.

Setting Up MailKit for Email Operations

Once installed, you can begin setting up MailKit in your application. This involves configuring the SMTP server for sending emails and, optionally, the IMAP server for receiving emails. Here's a basic setup:

using MailKit.Net.Smtp;
using MimeKit;

public class EmailService
{
    public void SendEmail(string recipientAddress, string subject, string body)
    {
        var message = new MimeMessage();
        message.From.Add(new MailboxAddress("Your Name", "your@email.com"));
        message.To.Add(new MailboxAddress("", recipientAddress));
        message.Subject = subject;

        // Set the email body as plain text
        message.Body = new TextPart("plain")
        {
            Text = body
        };

        using (var client = new SmtpClient())
        {
            // Connect to the SMTP server
            client.Connect("smtp.server.com", 587, false);
            // Authenticate using your email credentials
            client.Authenticate("your@email.com", "yourpassword");
            // Send the email
            client.Send(message);
            // Disconnect from the server
            client.Disconnect(true);
        }
    }
}

using MailKit.Net.Smtp;
using MimeKit;

public class EmailService
{
    public void SendEmail(string recipientAddress, string subject, string body)
    {
        var message = new MimeMessage();
        message.From.Add(new MailboxAddress("Your Name", "your@email.com"));
        message.To.Add(new MailboxAddress("", recipientAddress));
        message.Subject = subject;

        // Set the email body as plain text
        message.Body = new TextPart("plain")
        {
            Text = body
        };

        using (var client = new SmtpClient())
        {
            // Connect to the SMTP server
            client.Connect("smtp.server.com", 587, false);
            // Authenticate using your email credentials
            client.Authenticate("your@email.com", "yourpassword");
            // Send the email
            client.Send(message);
            // Disconnect from the server
            client.Disconnect(true);
        }
    }
}

Imports MailKit.Net.Smtp
Imports MimeKit

Public Class EmailService
	Public Sub SendEmail(ByVal recipientAddress As String, ByVal subject As String, ByVal body As String)
		Dim message = New MimeMessage()
		message.From.Add(New MailboxAddress("Your Name", "your@email.com"))
		message.To.Add(New MailboxAddress("", recipientAddress))
		message.Subject = subject

		' Set the email body as plain text
		message.Body = New TextPart("plain") With {.Text = body}

		Using client = New SmtpClient()
			' Connect to the SMTP server
			client.Connect("smtp.server.com", 587, False)
			' Authenticate using your email credentials
			client.Authenticate("your@email.com", "yourpassword")
			' Send the email
			client.Send(message)
			' Disconnect from the server
			client.Disconnect(True)
		End Using
	End Sub
End Class

Imports MailKit.Net.Smtp
Imports MimeKit

Public Class EmailService
	Public Sub SendEmail(ByVal recipientAddress As String, ByVal subject As String, ByVal body As String)
		Dim message = New MimeMessage()
		message.From.Add(New MailboxAddress("Your Name", "your@email.com"))
		message.To.Add(New MailboxAddress("", recipientAddress))
		message.Subject = subject

		' Set the email body as plain text
		message.Body = New TextPart("plain") With {.Text = body}

		Using client = New SmtpClient()
			' Connect to the SMTP server
			client.Connect("smtp.server.com", 587, False)
			' Authenticate using your email credentials
			client.Authenticate("your@email.com", "yourpassword")
			' Send the email
			client.Send(message)
			' Disconnect from the server
			client.Disconnect(True)
		End Using
	End Sub
End Class

Setting Up SMTP and IMAP Servers

Configuring SMTP Server for Sending Emails

To send emails using MailKit, you need to configure an SMTP server. The SMTP (Simple Mail Transfer Protocol) server is responsible for sending your emails to the intended recipients. Here's a guide to setting up an SMTP server in your application:

Choose an SMTP Service: You can use a popular email service like Gmail, Outlook, or any other that provides SMTP support.
SMTP Server Details: Obtain the SMTP server address, port number, and the necessary authentication details (username and password) for your chosen email service.

Example: SMTP Configuration for Gmail

Here's an example of configuring an SMTP client to send emails using Gmail's SMTP server:

using MailKit.Net.Smtp;

// Connecting and authenticating to Gmail's SMTP server
using (var smtpClient = new SmtpClient())
{
    smtpClient.Connect("smtp.gmail.com", 587, MailKit.Security.SecureSocketOptions.StartTls);
    smtpClient.Authenticate("yourgmail@gmail.com", "yourpassword");
    // Send your message here
    smtpClient.Disconnect(true);
}

using MailKit.Net.Smtp;

// Connecting and authenticating to Gmail's SMTP server
using (var smtpClient = new SmtpClient())
{
    smtpClient.Connect("smtp.gmail.com", 587, MailKit.Security.SecureSocketOptions.StartTls);
    smtpClient.Authenticate("yourgmail@gmail.com", "yourpassword");
    // Send your message here
    smtpClient.Disconnect(true);
}

Imports MailKit.Net.Smtp

' Connecting and authenticating to Gmail's SMTP server
Using smtpClient As New SmtpClient()
	smtpClient.Connect("smtp.gmail.com", 587, MailKit.Security.SecureSocketOptions.StartTls)
	smtpClient.Authenticate("yourgmail@gmail.com", "yourpassword")
	' Send your message here
	smtpClient.Disconnect(True)
End Using

Imports MailKit.Net.Smtp

' Connecting and authenticating to Gmail's SMTP server
Using smtpClient As New SmtpClient()
	smtpClient.Connect("smtp.gmail.com", 587, MailKit.Security.SecureSocketOptions.StartTls)
	smtpClient.Authenticate("yourgmail@gmail.com", "yourpassword")
	' Send your message here
	smtpClient.Disconnect(True)
End Using

Setting Up IMAP Server for Receiving Emails

To receive and read emails, configure an IMAP (Internet Message Access Protocol) server. IMAP allows you to access and manage your emails directly on the email server, making it a popular choice for email clients.

Connecting to an IMAP Server

To connect to an IMAP server, you'll need the server address, port number, and account credentials. Here's a basic connection setup:

using MailKit.Net.Imap;

// Connecting and authenticating to Gmail's IMAP server
using (var imapClient = new ImapClient())
{
    imapClient.Connect("imap.gmail.com", 993, true);
    imapClient.Authenticate("yourgmail@gmail.com", "yourpassword");
    // Access and manage your inbox here
    imapClient.Disconnect(true);
}

using MailKit.Net.Imap;

// Connecting and authenticating to Gmail's IMAP server
using (var imapClient = new ImapClient())
{
    imapClient.Connect("imap.gmail.com", 993, true);
    imapClient.Authenticate("yourgmail@gmail.com", "yourpassword");
    // Access and manage your inbox here
    imapClient.Disconnect(true);
}

Imports MailKit.Net.Imap

' Connecting and authenticating to Gmail's IMAP server
Using imapClient As New ImapClient()
	imapClient.Connect("imap.gmail.com", 993, True)
	imapClient.Authenticate("yourgmail@gmail.com", "yourpassword")
	' Access and manage your inbox here
	imapClient.Disconnect(True)
End Using

Imports MailKit.Net.Imap

' Connecting and authenticating to Gmail's IMAP server
Using imapClient As New ImapClient()
	imapClient.Connect("imap.gmail.com", 993, True)
	imapClient.Authenticate("yourgmail@gmail.com", "yourpassword")
	' Access and manage your inbox here
	imapClient.Disconnect(True)
End Using

Advanced Email Handling and Building a Complete Email Application

Integrating Advanced MailKit Features

Once you've set up the basic functionalities for sending and receiving emails with MailKit, it's time to explore its advanced capabilities.

These include handling HTML emails, using HTML email templates, attaching files, and implementing client-side sorting and searching within the email inbox.

using MimeKit;

// Creating a MimeMessage for an HTML email
var message = new MimeMessage();
message.From.Add(new MailboxAddress("Your Name", "your@email.com"));
message.To.Add(new MailboxAddress("", "recipient@email.com"));
message.Subject = "Your Subject Here";

// Build the HTML body
var builder = new BodyBuilder
{
    HtmlBody = @"<html><body><h1>Hello, World!</h1></body></html>"
};

// Set the message body
message.Body = builder.ToMessageBody();

using MimeKit;

// Creating a MimeMessage for an HTML email
var message = new MimeMessage();
message.From.Add(new MailboxAddress("Your Name", "your@email.com"));
message.To.Add(new MailboxAddress("", "recipient@email.com"));
message.Subject = "Your Subject Here";

// Build the HTML body
var builder = new BodyBuilder
{
    HtmlBody = @"<html><body><h1>Hello, World!</h1></body></html>"
};

// Set the message body
message.Body = builder.ToMessageBody();

Imports MimeKit

' Creating a MimeMessage for an HTML email
Private message = New MimeMessage()
message.From.Add(New MailboxAddress("Your Name", "your@email.com"))
message.To.Add(New MailboxAddress("", "recipient@email.com"))
message.Subject = "Your Subject Here"

' Build the HTML body
Dim builder = New BodyBuilder With {.HtmlBody = "<html><body><h1>Hello, World!</h1></body></html>"}

' Set the message body
message.Body = builder.ToMessageBody()

Imports MimeKit

' Creating a MimeMessage for an HTML email
Private message = New MimeMessage()
message.From.Add(New MailboxAddress("Your Name", "your@email.com"))
message.To.Add(New MailboxAddress("", "recipient@email.com"))
message.Subject = "Your Subject Here"

' Build the HTML body
Dim builder = New BodyBuilder With {.HtmlBody = "<html><body><h1>Hello, World!</h1></body></html>"}

' Set the message body
message.Body = builder.ToMessageBody()

Implementing HTML Templates

You can also use HTML templates for email content, allowing for more dynamic and visually appealing emails. These templates can be loaded from external files or embedded resources, providing flexibility in how you manage email content.

Building a Complete Email Application

With the foundations covered, the next step will be to build a complete email application using MailKit. This involves:

Creating a User Interface: Developing a user-friendly interface for your email client allows users to easily compose, send, receive, and read emails.
Incorporating MailKit Features: Integrate the full range of MailKit's functionalities into your application, such as SMTP and IMAP servers, different content type support, and email organization.
User Interactions and Feedback: Implement features for user interactions, like buttons for sending emails, viewing the inbox folder, and converting emails to PDF. Provide feedback and handle exceptions to ensure a smooth user experience.
Testing and Deployment: Thoroughly test your email application to ensure all functionalities work as expected. Deploy the application for users to install and use on their devices.

How to use MailKit and IronPDF

IronPDF is a lightweight .NET PDF library designed specifically with web developers in mind. It makes reading, writing, and manipulating PDF files a breeze, able to convert all kinds of file types into PDF content, and you can use it in your .NET projects for both desktop and web. The best part - it's free to try out in a development environment.

You can use MailKit and IronPDF together for industry-leading email-to-PDF conversion. Here's a basic implementation:

using IronPdf;

// Render an HTML string as a PDF
var renderer = new IronPdf.ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<html><body><h1>Hey, Chandler!</h1></body></html>");

// Save the PDF document
pdf.SaveAs("EmailContent.pdf");

using IronPdf;

// Render an HTML string as a PDF
var renderer = new IronPdf.ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<html><body><h1>Hey, Chandler!</h1></body></html>");

// Save the PDF document
pdf.SaveAs("EmailContent.pdf");

Imports IronPdf

' Render an HTML string as a PDF
Private renderer = New IronPdf.ChromePdfRenderer()
Private pdf = renderer.RenderHtmlAsPdf("<html><body><h1>Hey, Chandler!</h1></body></html>")

' Save the PDF document
pdf.SaveAs("EmailContent.pdf")

Imports IronPdf

' Render an HTML string as a PDF
Private renderer = New IronPdf.ChromePdfRenderer()
Private pdf = renderer.RenderHtmlAsPdf("<html><body><h1>Hey, Chandler!</h1></body></html>")

' Save the PDF document
pdf.SaveAs("EmailContent.pdf")

IronPDF is easy to use, but it's even easier to install. There are a couple of ways you can do it:

Method 1: NuGet Package Manager Console

In Visual Studio, in Solution Explorer, right-click References, and then click Manage NuGet Packages. Hit browse and search 'IronPDF, and install the latest version. If you see this, it's working:

You can also go to Tools -> NuGet Package Manager -> Package Manager Console, and enter the following line in the Package Manager Tab:

PM > Install-Package IronPdf

Install-Package IronPdf

Finally, you can get IronPDF directly from IronPDF's Page on NuGet. Select the Download Package option from the menu on the right and double-click your download to install it automatically, then reload the Solution to start using it in your project.

Didn't work? You can find platform-specific help on our Advanced NuGet Installation Instructions.

Method 2: Using a DLL file

You can also get the IronPDF DLL file straight from us and add it to Visual Studio manually. For full instructions and links to the Windows, MacOS, and Linux DLL packages, check out our dedicated Installation Guide for IronPDF.

Conclusion

By integrating MailKit and IronPDF, you can create a versatile email client capable of handling a variety of email-related tasks, including converting emails to PDFs. This application not only serves as a powerful tool for email communication but also demonstrates the practical application of these libraries in a real-world scenario.

Ready to get your hands on IronPDF? You can start with our IronPDF 30-day Free Trial. It's also completely free to use for development purposes, so you can really get to see what it's made of. If you like what you see, IronPDF starts as low as $999. For even bigger savings, check out the Iron Software Suite Licensing Options where you can get all 10 Iron Software tools for the price of two. Happy coding!

Jacob Mellor

Chat with engineering team now

Chief Technology Officer

Jacob Mellor is Chief Technology Officer at Iron Software and a visionary engineer pioneering C# PDF technology. As the original developer behind Iron Software's core codebase, he has shaped the company's product architecture since its inception, transforming it alongside CEO Cameron Rimington into a 50+ person company serving NASA, Tesla, and global government agencies.

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