Rust

Remove a MIME Header Field

Demonstrates the Chilkat Mime.RemoveHeaderField method, which removes header fields whose name matches case-insensitively. The first argument is the field name and the second (bAllOccurrences) selects whether to remove all matches or only the first. It is a void method.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Stripping headers is common when reprocessing a message — removing spam-scoring X- headers, clearing an old Content-Length before re-serializing, or deleting routing headers before forwarding. The all-occurrences flag matters for headers that can repeat: pass true to purge every instance, or false to drop just the first.

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Rust


let mime = chilkat::Mime::new();
if mime.load_mime_file("qa_data/message.eml").is_err() {
    println!("{}", mime.last_error_text());
    return;
}

// Remove header fields whose name matches (case-insensitively).  The 1st argument is the field
// name and the 2nd (bAllOccurrences) selects whether to remove all matches or only the first.
// RemoveHeaderField is a void method.

// Remove every X-Spam-Status header.
let b_all_occurrences = true;
mime.remove_header_field("X-Spam-Status", b_all_occurrences);

println!("Removed the header field(s).");