Rust

Office365 Send Email using SMTP with OAuth2 Authentication

See more Office365 Examples

Demonstrates how to send email from smtp.office365.com using OAuth2 authentication. Rust

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// An Office365 OAuth2 access token must first be obtained prior
// to running this code.

// Getting the OAuth2 access token for the 1st time requires the O365 account owner's 
// interactive authorization via a web browser.  Afterwards, the access token
// can be repeatedly refreshed automatically (with no user interaction).

// See the following examples for getting and refreshing an OAuth2 access token

// Get Office365 SMTP/IMAP/POP3 OAuth2 Access Token
// Refresh Office365 SMTP/IMAP/POP3 OAuth2 Access Token

// First get our previously obtained OAuth2 access token.
let json_token = chilkat::JsonObject::new();
let _ = json_token.load_file("qa_data/tokens/office365.json").is_ok();

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

mailman.set_smtp_host("smtp.office365.com");
mailman.set_smtp_port(587);
mailman.set_start_tls(true);

// Use your Office365 email address for the SmtpUsername.
mailman.set_smtp_username("OFFICE365_EMAIL_ADDRESS");
mailman.set_o_auth2_access_token(&json_token.string_of("access_token").unwrap_or_default());

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

email.set_subject("This is a test");
email.set_body("This is a test");
email.set_from("MY_NAME <OFFICE365_EMAIL_ADDRESS>");
let _ = email.add_to("John Doe", "somebody@example.com").is_ok();

// Call SendEmail to connect to the SMTP server and send.
// The connection (i.e. session) to the SMTP server remains
// open so that subsequent SendEmail calls may use the
// same connection.  
if mailman.send_email(&email).is_err() {
    println!("{}", mailman.last_error_text());
    return;
}

// If SendEmail failed because of "Failed to get initial SMTP Response", then it may be 
// a firewall or anti-virus blocking communications.
// See https://cknotes.com/smtp-office365-com-failed-to-get-initial-smtp-response/

if mailman.close_smtp_connection().is_err() {
    println!("Connection to SMTP server not closed cleanly.");
}

println!("Mail Sent!");