How Can I Save a MailMessage Object to Disk as an EML or MSG File?

Persisting MailMessage Objects as EML or MSG Files

The .NET MailMessage class doesn't offer a direct method for saving itself to disk. However, there are workarounds to achieve this, depending on your needs.

One approach involves redirecting email delivery to the file system using SmtpClient. This method doesn't create EML or MSG files directly, but instead generates files that can be processed later.

Method 1: Programmatic Configuration

This approach configures the SmtpClient to write emails to a specified directory:

SmtpClient client = new SmtpClient("mysmtphost");
client.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
client.PickupDirectoryLocation = @"C:\somedirectory";
client.Send(message);

This will create email files in the specified directory. A separate process can then handle forwarding these files.

Method 2: App Configuration

Alternatively, you can configure the delivery method through your application's configuration file:

<configuration>
  <system.net>
    <mailSettings>
      <smtp deliveryMethod="SpecifiedPickupDirectory">
        <specifiedPickupDirectory pickupDirectoryLocation="C:\somedirectory" />
      </smtp>
    </mailSettings>
  </system.net>
</configuration>

This achieves the same result as the programmatic approach. The email files are saved to the specified directory and can be processed subsequently.

Remember to choose a suitable directory and ensure your application has the necessary permissions to write to that location. This method is useful for batch processing or scenarios where immediate network transmission isn't required. For direct EML/MSG file creation, you would need to explore third-party libraries or custom file writing based on the email message's content.

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