Zig

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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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // 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.

    const email = try chilkat.Email.init();
    defer email.deinit();

    // Load a multipart/report email (such as a bounce / DSN message).
    email.loadEml("qa_data/eml/dsn_bounce.eml") catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

    const n = email.getNumReports();
    std.debug.print("NumReports = {d}\n", .{n});

    var i: i32 = 0;
    i = 0;
    while (i < n) : (i += 1) {
        std.debug.print("---- Report {d} ----\n", .{i});
        std.debug.print("{s}\n", .{try email.getReport(alloc, i)});
    }
}