Select Encryption Algorithm with SMTP Encrypted Email

Demonstrates how to select the encryption algorithm and strength (key size) when sending encrypted email.

Download Chilkat Email ActiveX for POP3 / SMTP

Download Chilkat IMAP ActiveX

LOCAL loMailman
LOCAL lnSuccess
LOCAL loEmail
LOCAL loCsp

*  The mailman object is used for sending and receiving email.
loMailman = CreateObject('Chilkat.MailMan2')

*  Any string argument automatically begins the 30-day trial.

lnSuccess = loMailman.UnlockComponent("30-day trial")
IF (lnSuccess <> 1) THEN
    =MESSAGEBOX("Component unlock failed")
    QUIT
ENDIF

*  Set the SMTP server.
loMailman.SmtpHost = "smtp.comcast.net"

*  Create a new email object
loEmail = CreateObject('Chilkat.Email2')

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

*  In this example, we've already installed the certificate for "admin@chilkatsoft.com"
*  in the current user's personal certificate store.
*  If the email.SendEncrypted property is set, Chilkat will
*  automatically search for and use the first non-expired certificate
*  matching the recipient'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.
loEmail.SendEncrypted = 1

*  Use the CSP object to select an encryption algorithm:
loCsp = CreateObject('Chilkat.Csp')
*  Make sure we're using the enhanced provider, which provides
*  access to stronger algorithms.
loCsp.SetProviderMicrosoftEnhanced()

*  Select 168-bit 3DES (i.e. 192-bit DES if you include the parity bits)
loCsp.SetEncryptAlgorithm("3DES")

*  Tell the email to use this CSP:
loEmail.SetCSP(loCsp)

lnSuccess = loMailman.SendEmail(loEmail)
IF (lnSuccess <> 1) THEN
    =MESSAGEBOX(loMailman.LastErrorText)
ELSE
    *  Examine the LastErrorText anyway, so we can see
    *  that 3DES was used...
    *  You should see these lines in the log:
    *  alg_name: 3DES
    *  alg_bits: 168
    =MESSAGEBOX(loMailman.LastErrorText)
ENDIF