Rust

Send Signed Email using PFX File

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file. Rust

// 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.
let mailman = chilkat::MailMan::new();

// Set the SMTP server.
mailman.set_smtp_host("smtp.mymailserver.com");

// Create a new email object
let email = chilkat::Email::new();

email.set_subject("This email is signed");
email.set_body("This is a digitally signed mail");
email.set_from("Chilkat Admin <admin@chilkatsoft.com>");
let _ = email.add_to("Chilkat Support", "support@chilkatsoft.com").is_ok();

// Indicate that the email should be sent signed.
email.set_send_signed(true);

// Tell the mailman to use a PFX file as a source for locating
// the certificate and private key required for signing.
// The certificate chosen for signing will be the one that
// matches the sender's email address, which also has
// a private key.  All intermediate certs in the chain of 
// authentication, up to and including the root, will
// be included in the signature.
if mailman.add_pfx_source_file("/pfx_files/chilkatsoft_secret.pfx", "secret").is_err() {
    println!("{}", mailman.last_error_text());
    return;
}

// Signed email can be sent in two different ways.  
// In a multipart/signed email, the signature is attached as a separate MIME part.
// In an opaque email (signedData) the content of the email is encapsulated within the signature
// and the email is sent as "application/pkcs7-mime". 
// Either should be fine, but some receiving systems might require one or the other..
mailman.set_opaque_signing(false);

// Send a signed email.
if mailman.send_email(&email).is_err() {
    println!("{}", mailman.last_error_text());
} else {
    // The LastErrorText property provides information
    // even when successful.
    println!("{}", mailman.last_error_text());
    println!("Mail Sent!");
}