The flexible MTA for large-scale email services

Halon MTA makes you more competitive, by secure and timely delivery of important emails and rapid feature implementation. At the same time, you will cut your development and maintenance costs by half.

What's your business?

Sender

Marketing or transactional

Mailbox provider

Carrier, ISP or hosting

System integrator

Managed service provider

Halon enabled us to reduce initial capital cost, ongoing support and maintenance costs, rack space, and ongoing power and cooling requirements by up to 70%.

Søren Visti Kristensen, One.com. Case study

Halon can do more than we expected. We should have chosen Halon earlier; we could never have built a solution like this on our own.

Marc van de Geijn, bHosted. Case study

We reduced hosting costs, saved 30% on operating costs, reduced time of managing by 90% and improved customer response time to minutes from hours.

Brad Slavin, DuoCircle Case study

It is rare that I recommend a commercial product at all, but Halon deserves it. The software is very robust, and it is easy to follow the flow of emails.

Peter Magnusson, Crystone

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What's up

Customer testimonial

KPN is the largest Dutch telecommunications and IT service provider. Read about why they chose Halon MTA.

Welcome SUNET!

The Swedish University Computer Network provides higher education institutions with access to well-developed national and international data communication and related services.

Welcome MSG91!

The #1 A2P communication provider in India, serving clients worldwide. They use Halon MTA for their transactional email service.

We're hiring!

We're looking for coding-savvy DevOps engineers, Node.js developers and a business development representative. Those openings offers many exciting tasks and the possibility for a fast development track. See all jobs.

Latest from the blog

Halon integrates seamlessly with Spamhaus's new hash blocklist for added security. Read more in our blog.

Halon 5.7

Bringing exception handling to Halon's scripting language, as well as debugging in Visual Studio Code. Read about our latest quarterly software release, 5.7 catchy.

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• The Halon MTA is a flexible email operations and security platform. It enables organisations that operate large-scale email services to offer competitive features by rapid implementation and to lower maintenance costs through reliable deployment and reduced complexity.

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if ($message["transportid"] === "bounces")
    Try(["protocol" => "smtp"]); // Use SMTP for locally generated DSNs
// Use a more robust lookup like https://wiki.halon.io/API_calls
$route = cache ["ttl" => 3600] http("$apiurl/route", [], [$message["recipientaddress"]["domain"]]);
$route = json_decode($route);
if (!is_array($route))
    Queue(["delay" => 3600, "reason" => "Invalid route", "increment_retry" => false]);
Try(["protocol" => "lmtp", "server" => $route["storage"]]);

$options = [];
if (GetMetaData()["spam"] == "yes") {
    $options["sourceip"] = ["4"]; // Bulk IP
} else {
    // Source hash
    $addrs = ["1", "2", "3"];
    $sourcehash = number("0x".md5($message["senderaddress"]["domain"])[0:6]);
    $options["sourceip"] = [$addrs[$sourcehash % length($addrs)]];
}
Try($options);

// In the post-delivery script
$senderdomain = $message["senderaddress"]["domain"];
$errorcode = $arguments["attempt"]["result"]["code"];
if ($errorcode >= 400)
    rate("delivery-failures", $senderdomain, 1000, 3600);

// In the MAIL FROM script
$senderdomain = $arguments["address"]["domain"];
if (rate("delivery-failures", $senderdomain, 0, 3600) > 999)
    Defer("$senderdomain has more than 1000 failed deliveries during the last hour");

// Per-domain DKIM signing using external database
// Use a more robust lookup like https://wiki.halon.io/API_calls
$dkim = cache ["ttl" => 86400, "size"=> 32768, "ttl_override" => ["" => 60]]
    http("$apiurl/dkim/$1", ["timeout" => 10], [$transaction["senderaddress"]["domain"]]);
$dkim = json_decode($dkim);
if (is_array($dkim))
    $arguments["mail"]->signDKIM($dkim["selector"], $dkim["domain"], $dkim["rsakey"]);