Zig

Read Delivery-Status Fields from a Bounce

Demonstrates the Chilkat Email.GetDeliveryStatusInfo method, which returns a named field from the message/delivery-status part of a delivery-status notification (DSN). It should be called only for an email identified as a delivery-status notification. This example loads a bounce message and reads its Action, Status, and Final-Recipient fields.

Background: When a message can't be delivered, the mail system returns a bounce as a multipart/report whose message/delivery-status part carries machine-readable fields: Action (e.g. failed), Status (a numeric code like 5.1.1 meaning "no such mailbox"), and Final-Recipient (the address that failed). Parsing these lets a program automatically detect hard bounces and prune bad addresses from a mailing list.

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Zig

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

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

    // Demonstrates the GetDeliveryStatusInfo method, which returns a field from the
    // message/delivery-status part of a delivery-status notification (DSN / bounce).
    // Call it only for an email that is a delivery-status notification.

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

    email.loadEml("qa_data/eml/dsn_bounce.eml") catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

    // Read individual fields from the message/delivery-status part.
    std.debug.print("Action: {s}\n", .{try email.getDeliveryStatusInfo(alloc, "Action")});
    std.debug.print("Status: {s}\n", .{try email.getDeliveryStatusInfo(alloc, "Status")});
    std.debug.print("Final-Recipient: {s}\n", .{try email.getDeliveryStatusInfo(alloc, "Final-Recipient")});

    // Note: The path "qa_data/..." is a relative local filesystem path,
    // relative to the current working directory of the running application.
}