(PowerShell) Send Signed Email using PFX File

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

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

# Set the SMTP server.
$mailman.SmtpHost = "smtp.mymailserver.com"

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

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

# Indicate that the email should be sent signed.
$email.SendSigned = $true

# Tell the mailman to use a PFX file as a source for locating
# the certificate and private key required for signing.
# The certificate chosen for signing will be the one that
# matches the sender's email address, which also has
# a private key.  All intermediate certs in the chain of 
# authentication, up to and including the root, will
# be included in the signature.
$success = $mailman.AddPfxSourceFile("/pfx_files/chilkatsoft_secret.pfx","secret")
if ($success -ne $true) {
    $($mailman.LastErrorText)
    exit
}

# Signed email can be sent in two different ways.  
# In a multipart/signed email, the signature is attached as a separate MIME part.
# In an opaque email (signedData) the content of the email is encapsulated within the signature
# and the email is sent as "application/pkcs7-mime". 
# Either should be fine, but some receiving systems might require one or the other..
$mailman.OpaqueSigning = $false

# Send a signed email.
$success = $mailman.SendEmail($email)
if ($success -ne $true) {
    $($mailman.LastErrorText)
}
else {
    # The LastErrorText property provides information
    # even when successful.
    $($mailman.LastErrorText)
    $("Mail Sent!")
}