Zig

Set the Reply-To Address of an Email

Demonstrates the Chilkat Email.ReplyTo property, which sets the MIME Reply-To header. This header automatically defaults to the From address, so you only set it when replies should go to a different address. There is usually a single Reply-To address, but you can supply a comma-separated list for several. Setting this changes only the Reply-To header — it does not change the SMTP envelope sender or the visible From header.

Background: When you hit "Reply," most mail clients address the response to the message's Reply-To header if present, otherwise to From. This is useful when the sending address is not the right destination for responses — for example, a newsletter sent from noreply@ but with Reply-To pointing at a monitored support inbox, or a message sent on someone's behalf that should be answered to a different person.

Chilkat Zig Downloads

Download Chilkat for Zig

Zig

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

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

    // Demonstrates the Email.ReplyTo property, which sets the Reply-To header field.
    // Reply-To defaults to the From address, so you only set this when replies should
    // go somewhere different.

    const email = try chilkat.Email.init();
    defer email.deinit();
    email.setFrom("sales@example.com");

    // Replies should be directed to a different address than the From address.
    email.setReplyTo("support@example.com");

    std.debug.print("ReplyTo = {s}\n", .{try email.getReplyTo(alloc)});

    // For multiple reply addresses, use a comma-separated list.
    email.setReplyTo("support@example.com, help@example.com");
    std.debug.print("ReplyTo = {s}\n", .{try email.getReplyTo(alloc)});
}