Tcl

Send Encrypted Email to Multiple Recipients

Demonstrates how to create and send an S/MIME encrypted email to multiple recipients. The digital certificate of each recipient is required. The encrypting/sending process uses each recipient's digital certificate (which internally contains the public key). Each recipient decrypts the received email using his/her private key. Tcl

load ./chilkat.dll

set success 0

# 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.
set mailman [new_CkMailMan]

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

# Load each recipient's certificate into a Chilkat certificate object.
# This example loads the certificates from files.  However, the Chilkat
# certificate object provides other means for loading certificates,
# such as from in-memory PEM strings, or in-memory binary DER encoded form, etc.
set cert1 [new_CkCert]

set success [CkCert_LoadFromFile $cert1 "recipient1.cer"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert1]
    delete_CkMailMan $mailman
    delete_CkCert $cert1
    exit
}

set cert2 [new_CkCert]

set success [CkCert_LoadFromFile $cert2 "recipient2.cer"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert2]
    delete_CkMailMan $mailman
    delete_CkCert $cert1
    delete_CkCert $cert2
    exit
}

set cert3 [new_CkCert]

set success [CkCert_LoadFromFile $cert3 "recipient3.cer"]
if {$success != 1} then {
    puts [CkCert_lastErrorText $cert3]
    delete_CkMailMan $mailman
    delete_CkCert $cert1
    delete_CkCert $cert2
    delete_CkCert $cert3
    exit
}

# Create a new email object
set email [new_CkEmail]

CkEmail_put_Subject $email "This email is encrypted and sent to 3 recipients"
CkEmail_put_Body $email "This is an S/MIME encrypted mail sent to 3 recipients"
CkEmail_put_From $email "Chilkat Support <support@chilkatsoft.com>"

# Make each of the certificates available for encrypting the email
# by calling AddEncryptCert for each.
set success [CkEmail_AddEncryptCert $email $cert1]
if {$success == 1} then {
    set success [CkEmail_AddEncryptCert $email $cert2]
}

if {$success == 1} then {
    set success [CkEmail_AddEncryptCert $email $cert3]
}

if {$success != 1} then {
    puts [CkEmail_lastErrorText $email]
    delete_CkMailMan $mailman
    delete_CkCert $cert1
    delete_CkCert $cert2
    delete_CkCert $cert3
    delete_CkEmail $email
    exit
}

# Add 3 recipients to the email (2 TO addresses, and 1 CC address)
set success [CkEmail_AddTo $email "Recipient 1" "admin@cknotes.com"]
set success [CkEmail_AddTo $email "Recipient 2" "somebody001122@yahoo.com"]
set success [CkEmail_AddCC $email "Recipient 3" "somebody123xyz@gmail.com"]

# Indicate that the email is to be sent encrypted.
CkEmail_put_SendEncrypted $email 1

# Send the encrypted email...
set success [CkMailMan_SendEmail $mailman $email]
if {$success != 1} then {
    puts [CkMailMan_lastErrorText $mailman]
} else {
    puts "Encrypted Email Sent!"
}


delete_CkMailMan $mailman
delete_CkCert $cert1
delete_CkCert $cert2
delete_CkCert $cert3
delete_CkEmail $email