Send S/MIME Signed Email

Send digitally signed email using the digital certificate of the recipient. To successfully sign, the sender's certificate must be pre-installed with private key. Typically, this is done via a .pfx file, or through Internet Explorer. If your code is going to run within ASP, ASP.NET, or a Windows Service, you will need to follow the instructions here (http://blog.chilkatsoft.com/?p=149) to import your certificate w/ private key such that it is accessible by the calling process.

Downloads for Windows/Linux and Install Instructions

require 'rubygems'
require 'chilkat'

# The mailman object is used for sending and receiving email.
mailman = Chilkat::CkMailMan.new()

# Any string argument automatically begins the 30-day trial.
success = mailman.UnlockComponent("30-day trial")
if (success != true)
    print "Component unlock failed" + "\n"
    exit
end

# Set the SMTP server.
mailman.put_SmtpHost("smtp.comcast.net")

# Create a new email object
email = Chilkat::CkEmail.new()

email.put_Subject("This email is signed")
email.put_Body("This is a digitally signed mail")
email.put_From("Chilkat Support <admin@chilkatsoft.com>")
email.AddTo("John","john@example.com")

# In this example, we've already installed the certificate for "admin@chilkatsoft.com"
# (with private key) in the current user's personal certificate store.
# If the email.SendSigned property is set, Chilkat will
# automatically search for and use the first non-expired certificate
# matching the sender's email address.  Chilkat searches
# the Current User's Personal certificate store, as well
# as the Local Machine's Personal certificate store.
# Run certmgr.msc to view the certs in the Current User's
# certificate store.
email.put_SendSigned(true)

success = mailman.SendEmail(email)
if (success != true)
    print mailman.lastErrorText() + "\n"
else
    print "Mail Sent!" + "\n"
end