(PowerShell) Send Signed Email using PFX File (long version)

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

# Load a PFX file into a certificate store object.
# Then locate the certificate matching the  sender's email address,
# and use it for signing.
# (a PFX file may contain more than one certificate.)
$certStore = New-Object Chilkat.CertStore
# The 1st argument is the path of the PFX file, the 2nd arg is the 
# PFX file's password:
$success = $certStore.LoadPfxFile("/pfx_files/chilkatsoft_secret.pfx","secret")
if ($success -ne $true) {
    $($certStore.LastErrorText)
    exit
}

$cert = $certStore.FindCertBySubjectE("admin@chilkatsoft.com")
if ($certStore.LastMethodSuccess -eq $false) {
    $($certStore.LastErrorText)
    exit
}

# Alternatively, if a PFX file is known to contain a single certificate,
# you may load it directly into a Chilkat certificate object.
# This snippet of source code shows how:
$cert2 = New-Object Chilkat.Cert
# The 1st argument is the filename, the 2nd arg is the 
# PFX file's password:
$success = $cert2.LoadPfxFile("/pfx_files/chilkatsoft_secret.pfx","secret")
if ($success -ne $true) {
    $($cert2.LastErrorText)

    exit
}

# This example will use the cert from the certStore...
$success = $email.SetSigningCert($cert)

# 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!")
}