Rust

Count the Report Parts in a multipart/report Email

Demonstrates the read-only Chilkat Email.NumReports property, which is the number of report parts in a multipart/report email. A part is counted as a report when its Content-Type is message/* (except message/rfc822) or text/rfc822-headers. Use GetReport to retrieve the body of each report part; indexes are zero-based. This example loads a report email and prints each report part.

Background: When a message can't be delivered, the mail system usually sends back a bounce known as a Delivery Status Notification (DSN). DSNs use the multipart/report structure, which bundles several parts: a human-readable explanation, a machine-readable message/delivery-status part describing exactly what happened (recipient, status code, failing server), and often the original message's headers. Reading these report parts lets a program automatically detect and process bounces.

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// Demonstrates the read-only Email.NumReports property, which is the number of report
// parts in a multipart/report email (for example, a Delivery Status Notification).
// Use GetReport to retrieve the body of each report part.  Indexes are zero-based.

let email = chilkat::Email::new();

// Load a multipart/report email (such as a bounce / DSN message).
if email.load_eml("qa_data/eml/dsn_bounce.eml").is_err() {
    println!("{}", email.last_error_text());
    return;
}

let n = email.num_reports();
println!("NumReports = {}", n);

for i in 0..n {
    println!("---- Report {} ----", i);
    println!("{}", email.get_report(i).unwrap_or_default());
}