Zig

Count the Attached Messages in an Email

Demonstrates the read-only Chilkat Email.NumAttachedMessages property, which is the number of embedded emails represented by message/rfc822 MIME parts. These are counted separately from ordinary attachments and related items, and their indexes are zero-based. This example builds an inner email, attaches it to an outer email as a nested message, and prints the count.

Background: When you "forward as attachment," many mail clients embed the original message as a complete nested email rather than quoting its text. In MIME this appears as a message/rfc822 part — an entire email (its own headers and body) tucked inside the carrier message. Chilkat distinguishes three kinds of enclosed content: ordinary attachments (NumAttachments), inline related items (NumRelatedItems), and these nested messages (NumAttachedMessages). Use GetAttachedEmail to pull an embedded message into its own Email object.

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Zig

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

pub fn main() !void {
    // Demonstrates the read-only Email.NumAttachedMessages property, which is the
    // number of embedded emails (message/rfc822 MIME parts) contained in the email.

    // Create an inner email that we'll attach as a complete nested message.
    const inner_email = try chilkat.Email.init();
    defer inner_email.deinit();
    inner_email.setSubject("I am an attached message");
    inner_email.setBody("This entire email is nested inside another email.");
    inner_email.setFrom("alice@example.com");
    inner_email.addTo("Bob", "bob@example.com") catch {};

    // Create the outer email and attach the inner email directly as a
    // message/rfc822 part.  AttachEmail attaches a copy of the inner email.
    const email = try chilkat.Email.init();
    defer email.deinit();
    email.setSubject("Outer email with an attached message");
    email.setBody("See the attached email.");
    try email.attachEmail(inner_email);

    std.debug.print("NumAttachedMessages = {d}\n", .{email.getNumAttachedMessages()});
}