B4X

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. B4X

Dim success As Boolean = False

'  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.
Dim mailman As ChilkatMailMan
mailman.Initialize("mailman")

'  Set the SMTP server.
mailman.SmtpHost = "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.
Dim cert1 As ChilkatCert
cert1.Initialize("cert1")
success = cert1.LoadFromFile("recipient1.cer")
If success <> True Then
    Log(cert1.LastErrorText)
    Return
End If

Dim cert2 As ChilkatCert
cert2.Initialize("cert2")
success = cert2.LoadFromFile("recipient2.cer")
If success <> True Then
    Log(cert2.LastErrorText)
    Return
End If

Dim cert3 As ChilkatCert
cert3.Initialize("cert3")
success = cert3.LoadFromFile("recipient3.cer")
If success <> True Then
    Log(cert3.LastErrorText)
    Return
End If


'  Create a new email object
Dim email As ChilkatEmail
email.Initialize

email.Subject = "This email is encrypted and sent to 3 recipients"
email.Body = "This is an S/MIME encrypted mail sent to 3 recipients"
email.From = "Chilkat Support <support@chilkatsoft.com>"

'  Make each of the certificates available for encrypting the email
'  by calling AddEncryptCert for each.
success = email.AddEncryptCert(cert1)
If success = True Then
    success = email.AddEncryptCert(cert2)
End If

If success = True Then
    success = email.AddEncryptCert(cert3)
End If

If success <> True Then
    Log(email.LastErrorText)
    Return
End If


'  Add 3 recipients to the email (2 TO addresses, and 1 CC address)
success = email.AddTo("Recipient 1", "admin@cknotes.com")
success = email.AddTo("Recipient 2", "somebody001122@yahoo.com")
success = email.AddCC("Recipient 3", "somebody123xyz@gmail.com")

'  Indicate that the email is to be sent encrypted.
email.SendEncrypted = True

'  Send the encrypted email...
success = mailman.SendEmail(email)
If success <> True Then
    Log(mailman.LastErrorText)
Else
    Log("Encrypted Email Sent!")
End If