Free C# .NET Library for Reading & Writing Outlook Emails

Getting Started with NetOffice

The easiest way to install NetOffice is via NuGet. To use it from Visual Studio’s Package Manager Console, please enter the following command.

 Install-Package NetOfficeFw.Email 

git clone --recursive https://github.com/NetOfficeFw/NetOffice.git 

Send Email via Free C# API

NetOffice allows .NET programmers to send Outlook emails programmatically. In order to send emails, first, you need to initialize an Outlook.Application After your Outlook application is started you can create a new mail item in it, set recipients, subject, and body. After you are done with the email message, you send your email. By using the following lines of code, you can send your emails easily.

Send Email Messages C#

1. Start Outlook application by using Outlook.Application() method
2. Create a new email item by using outlookApplication.CreateItem() method and set item type as olMailItem
3. Add email recipients by using Recipients.Add() method and pass recipients as a string
4. Set email subject
5. Set email body
6. Send email
7. Quit and dispose of the outlook application

// start outlook
Outlook.Application outlookApplication = new Outlook.Application();

// create a new MailItem.
Outlook.MailItem mailItem = outlookApplication.CreateItem(OlItemType.olMailItem) as Outlook.MailItem;

// prepare item and send
mailItem.Recipients.Add("test@fileformat.com");
mailItem.Subject = "File Format Developer Guide";
mailItem.Body = "Send Emails programmatically in C#"
mailItem.Send();

// close outlook and dispose
outlookApplication.Quit();
outlookApplication.Dispose();

Retrieve Email Messages via C#

Retrieving emails from Outlook accounts is made efficient through the open source NetOffice's intuitive API. Software Developers can easily fetch emails based on various parameters such as date, sender, or subject, enabling them to implement powerful search and filtering functionalities. The library has included important functions for retrieving email messages, such as retrieve message asynchronously, retrieve message list, retrieve a specific message, retrieve to a file, and many more. Here is an example that shows how software developers can retrieve email messages inside C# .NET Applications.

// Filter emails from a specific sender
foreach (object item in inboxFolder.Items)
{
    if (item is MailItem mailItem && mailItem.SenderEmailAddress == "example@example.com")
    {
        // Process email...
    }
}

Manage Email Attachment

Managing email attachments is a crucial aspect of many applications. The free NetOffice .NET library makes it easy for software developers to handle email attachments inside their own .NET applications. The library excels in this area, allowing developers to seamlessly handle attachments, whether it's extracting them, adding new ones, or even modifying existing attachments with ease. The following example demonstrates how software developers can send email messages with atachments inside C# .NET Applications. The following example demonstrates how software developers can send email messages with attachments inside C# .NET Applications.

using NetOffice.OutlookApi;
using NetOffice.OutlookApi.Enums;

class Program
{
    static void Main(string[] args)
    {
        // Create a new instance of Outlook Application
        Application outlookApp = new Application();

        // Create a new MailItem
        MailItem mailItem = outlookApp.CreateItem(OlItemType.olMailItem);

        // Set email properties
        mailItem.Subject = "Test Email";
        mailItem.Body = "This is a test email.";

        // Add attachment
        mailItem.Attachments.Add(@"C:\Attachments\example.pdf", Type.Missing, Type.Missing, Type.Missing);

        // Send email
        mailItem.Send();

        // Release COM objects
        outlookApp.Quit();
    }
}