SmimeDecrypt Method (MailMessage)
Decrypts an e-mail message if it's encrypted.

Namespace: MailBee.Security
Assembly: MailBee.NET (in MailBee.NET.dll) Version: 12.3.0 build 647 for .NET 4.5
public SmimeResult Decrypt(
	MailMessage message


Type: MailBee.MimeMailMessage
The original encrypted message to be decrypted.

Return Value

Type: SmimeResult
A reference to SmimeResult object containing either the decrypted message or the original message if it was not encrypted; a null reference (Nothing in Visual Basic) if the decryption process failed.
MailBeeInvalidArgumentExceptionmessage is a null reference (Nothing in Visual Basic).
MailBeeCertificateStoreWin32ExceptionA WinAPI error occurred during opening Personal certificate store and ThrowExceptions is true.
MailBeeSmimeWin32ExceptionA WinAPI error occurred while performing S/MIME operation and ThrowExceptions is true.

This method looks for the appropriate certificate for decryption in the standard system certificate store named "MY" (Personal). The certificate must contain a private key. In the case if the required certificate resides in another store, use Decrypt(MailMessage, CertificateStore) overload.

To access the decrypted message, use DecryptedMessage property of the returned SmimeResult object. To get the certificate used for decryption, use DecryptionCertificate property of the same object.

To check if the original message was encrypted, examine IsEncrypted property value of the original MailMessage object.

To decrypt and verify a message within a single method call, use DecryptAndVerify(MailMessage, MessageVerificationFlags) method or its overloads.

This sample loads the message from disk, decrypts it, and displays its content.
// To use the code below, import these namespaces at the top of your code
using System;
using MailBee;
using MailBee.Mime;
using MailBee.Security;

// The actual code (put it into a method of your class)

// Load the message from file.
MailMessage msg = new MailMessage();

Smime objSmime = new Smime();

    // Decrypt the message.
    SmimeResult sResult = objSmime.Decrypt(msg);

    // Display the content of decrypted message.
    if (sResult.DecryptedMessage != null)
    if (sResult.DecryptionCertificate != null)
catch (MailBeeException ex)
See Also