public SmimeResult Decrypt2(
	MailMessage message,
	X509Certificate2Collection extraCerts
)

Public Function Decrypt2 ( 
	message As MailMessage,
	extraCerts As X509Certificate2Collection
) As SmimeResult

Parameters

message

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

extraCerts

Type: System.Security.Cryptography.X509CertificatesX509Certificate2Collection
The certificates to be searched for the appropriate certificate for decrypting the message (in addition to the Personal storage), or a null reference (Nothing in Visual Basic) if only Personal system storage should be used.

Return Value

This method looks for the appropriate certificate for decryption in the Personal storage and in the specified certificates. The certificate in question must contain a private key.

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 method is a version of Decrypt(MailMessage, CertificateStore) which accepts X509Certificate2Collection rather than CertificateStore. Starting from .NET Standard 2.0, you must use this method as CertificateStore functionality has been reduced to avoid dependency on Win32 API.

Note
This method is not available in .NET Сore 1.0/1.1. On that platform, use Decrypt(MailMessage, CertificateStore) instead.

Reference