Zig
Send HTML Email with Attachments

Demonstrates how to send an HTML email with file attachments.
Chilkat Zig Downloads

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

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

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const mailman = try chilkat.MailMan.init();
    defer mailman.deinit();

    mailman.setSmtpHost("smtp.my-starttls-mail-server.com");

    mailman.setSmtpUsername("MY-SMTP-USERNAME");
    mailman.setSmtpPassword("MY-SMTP-PASSWORD");

    mailman.setStartTLS(true);
    mailman.setSmtpPort(587);

    // Create a new email object
    const email = try chilkat.Email.init();
    defer email.deinit();
    email.setSubject("Test SMTP API to Send HTML Email with Attachments");
    email.setFrom("Joe Programmer <joe@my-starttls-mail-server.com>");
    email.addTo("Chilkat Support", "support@chilkatsoft.com") catch {};

    // Add a plain-text alternative body, which will likely never be seen.
    // (It is shown if the receiving email client is incapable of displaying HTML email.)
    email.addPlainTextAlternativeBody("This is a plain-text alternative body...") catch {};

    // Our HTML will include an image, so add the related image here.
    const content_id_starfish = email.addRelatedFile(alloc, "qa_data/jpg/starfish.jpg") catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

    // The src attribute for the image tag is set to the contentIdStarfish:
    const sb_html = try chilkat.StringBuilder.init();
    defer sb_html.deinit();
    sb_html.append("<html><body><p>This is an HTML email with an embedded image.</p>") catch {};
    sb_html.append("<p><img src=\"cid:CONTENT_ID_STARFISH\" /></p></body></html>") catch {};
    _ = sb_html.replace("CONTENT_ID_STARFISH", content_id_starfish);

    email.addHtmlAlternativeBody(try sb_html.getAsString(alloc)) catch {};

    // Finally, add some attachments to the email.
    // Add a file attachment.
    email.addFileAttachment2("qa_data/pdf/fishing.pdf", "application/pdf") catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

    // Add an attachment where the content is contained in a string.
    const content = "This is the content of the 2nd attached file.";
    email.addStringAttachment("someText.txt", content) catch {};

    // Send the HTML email.
    mailman.sendEmail(email) catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };

    mailman.closeSmtpConnection() catch {
        std.debug.print("Connection to SMTP server not closed cleanly.\n", .{});
    };

    std.debug.print("HTML email with attachments sent!\n", .{});
}