(PowerShell) Sending S/MIME Encrypted Email

Sends an encrypted email using the recipient's digital certificate from a .cer file.

Download: Chilkat .NET Assemblies

[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll")

#  The mailman object is used for sending and receiving email.
$mailman = New-Object Chilkat.MailMan

#  Any string argument automatically begins the 30-day trial.
$success = $mailman.UnlockComponent("30-day trial")
if ($success -ne $true) {
    $($mailman.LastErrorText)
    exit
}

#  Set the SMTP server.
$mailman.SmtpHost = "smtp.comcast.net"

#  Load the .cer file into a certificate object.
#  When sending S/MIME encrypted email, it is the recipient's
#  certificate that is used for encryption.  Only the public key
#  is needed to encrypt.  The recipient is the only
#  one possessing the private key, and therefore is the only
#  one able to decrypt.
$cert = New-Object Chilkat.Cert
$success = $cert.LoadFromFile("cknotes.cer")
if ($success -ne $true) {
    $($cert.LastErrorText)
    exit
}

#  Create a new email object
$email = New-Object Chilkat.Email

$email.Subject = "This email is encrypted"
$email.Body = "This is a digitally encrypted mail"
$email.From = "Chilkat Support <support@chilkatsoft.com>"
$email.AddTo("Chilkat Blog","admin@cknotes.com")

#  Indicate that the email is to be sent encrypted.
$email.SendEncrypted = $true

#  Specify the certificate to be used for encryption.
$email.SetEncryptCert($cert)

$success = $mailman.SendEmail($email)
if ($success -ne $true) {
    $($mailman.LastErrorText)
}
else {
    $("Mail Sent!")
}