How Can I Save MailMessage Objects to Disk as EM or MSG Files?

Persisting MailMessage Objects as EM or MSG Files

The absence of a built-in Save() method for MailMessage objects often presents a challenge when archiving emails locally. However, several methods effectively address this limitation.

Leveraging SmtpClient's Pickup Directory Feature

The SmtpClient class offers a flexible solution via its DeliveryMethod property, specifically SpecifiedPickupDirectory. This allows you to redirect email messages to a local folder instead of transmitting them over a network. This effectively saves the MailMessage object as a file:

<code class="language-csharp">SmtpClient client = new SmtpClient(); // Use empty constructor
client.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
client.PickupDirectoryLocation = @"C:\somedirectory";
client.Send(message);</code>

Alternatively, configure this setting within your application's configuration file:

<code class="language-xml"><configuration>
  <system.net>
    <mailSettings>
      <smtp deliveryMethod="SpecifiedPickupDirectory">
        <specifiedPickupDirectory pickupDirectoryLocation="C:\somedirectory"/>
      </smtp>
    </mailSettings>
  </system.net>
</configuration></code>

Following the Send() operation, the email will be stored as an email file (typically MSG or EML format, depending on the system) in the designated directory.

Important Note: Using the empty constructor for SmtpClient is recommended, as the host specification is irrelevant for local file storage.

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