How Can I Save MailMessage Objects to Disk in .NET?

Persisting MailMessage Objects Locally in .NET

Directly saving a MailMessage object to disk isn't a built-in .NET feature. However, a workaround uses the SmtpClient class to simulate sending the email to a local directory.

Code-Based Approach

Programmatically configure SmtpClient as follows:

SmtpClient client = new SmtpClient("mysmtphost"); // "mysmtphost" is not actually used here
client.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
client.PickupDirectoryLocation = @"C:\somedirectory";
client.Send(message);

Configuration File Method

Alternatively, modify your application's configuration file:

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

Important Considerations:

• Employ the parameterless SmtpClient constructor to prevent accidental network transmission.
• The generated email files will reside in the designated directory after the "send" operation. You can then process or transmit them as required.

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