(Go) 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.

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    // 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 := chilkat.NewMailMan()

    // Set the SMTP server.
    mailman.SetSmtpHost("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.
    cert1 := chilkat.NewCert()
    success := cert1.LoadFromFile("recipient1.cer")
    if success != true {
        fmt.Println(cert1.LastErrorText())
        mailman.DisposeMailMan()
        cert1.DisposeCert()
        return
    }

    cert2 := chilkat.NewCert()
    success = cert2.LoadFromFile("recipient2.cer")
    if success != true {
        fmt.Println(cert2.LastErrorText())
        mailman.DisposeMailMan()
        cert1.DisposeCert()
        cert2.DisposeCert()
        return
    }

    cert3 := chilkat.NewCert()
    success = cert3.LoadFromFile("recipient3.cer")
    if success != true {
        fmt.Println(cert3.LastErrorText())
        mailman.DisposeMailMan()
        cert1.DisposeCert()
        cert2.DisposeCert()
        cert3.DisposeCert()
        return
    }

    // Create a new email object
    email := chilkat.NewEmail()

    email.SetSubject("This email is encrypted and sent to 3 recipients")
    email.SetBody("This is an S/MIME encrypted mail sent to 3 recipients")
    email.SetFrom("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 {
        success = email.AddEncryptCert(cert2)
    }

    if success == true {
        success = email.AddEncryptCert(cert3)
    }

    if success != true {
        fmt.Println(email.LastErrorText())
        mailman.DisposeMailMan()
        cert1.DisposeCert()
        cert2.DisposeCert()
        cert3.DisposeCert()
        email.DisposeEmail()
        return
    }

    // 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.SetSendEncrypted(true)

    // Send the encrypted email...
    success = mailman.SendEmail(email)
    if success != true {
        fmt.Println(mailman.LastErrorText())
    }
    else {
        fmt.Println("Encrypted Email Sent!")
    }


    mailman.DisposeMailMan()
    cert1.DisposeCert()
    cert2.DisposeCert()
    cert3.DisposeCert()
    email.DisposeEmail()