Fast, full-featured and highly scalable email processing platform

Your premium alternative to an open source MTA, supplemented with commercial anti-spam and anti-virus from Cyren and Sophos.

More than a "good enough" platform

Halon is known and highly praised by engineers and sysadmins, and adopted by large operators such as Dutch telco KPN and Danish web hosting provider One.com, as well as government agencies and municipalities. You and your customers deserve more than a "good enough" email platform. Halon is one of the fastest, most scalable messaging platforms available, optimized for large-scale email receiving and sending operations. Read more about the platform.

Get an edge on your competition

If you go for a product with a cheaper price tag, you are missing a big opportunity to get an edge on your competition and advance your own growth. A majority of email servers today are running on traditional legacy software, making you and your customers vulnerable to updates and integrations, while also costing you a ton of man-hours. Read more about how to get an edge your competition.

Streamline your receiving and sending

Halons capabilities are out of proportion to open source and commodity MTA technology. With Halon Scripting Language, the software takes a unique approach to how email can be managed. It will reduce OPEX and CAPEX by streamlining your receiving and sending at every touch point. Increase efficiency, performance and speed, while also increasing choice and flexibility around integration with applications and data sources. Read more about streamlining your infrastructure.

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%.

Anders Saaby, 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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• Halon is a flexible security and operations platform for in-transit email. It enables companies that build and operate large-scale email services to offer competitive features by rapid implementation, and to lower costs of maintenance through reliable deployment and reduced complexity.

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if (!$senderip) {
    SetProtocol("smtp"); // Use SMTP for locally generated DSNs
    Try();
}
// Use a more robust lookup like https://wiki.halon.io/API_calls
$route = cache ["ttl" => 3600] http("$apiurl/route", [], [$recipientdomain]);
$route = json_decode($route);
if (!is_array($route))
    Reschedule(3600, ["reason" => "Invalid route", "increment_retry" => false]);
SetDestination($route["storage"]);
SetProtocol("lmtp");

if (GetMetaData()["spam"] == "yes") {
    // Bulk IP
    SetSourceIP("netaddr:4");
} else {
    // Source hash
    $addrs = ["netaddr:1", "netaddr:2", "netaddr:3"];
    $sourcehash = number("0x".md5($senderdomain)[0:6]);
    SetSourceIP($addrs[$sourcehash % count($addrs)]);
}
$ptr = cache ["ttl" => 3600] dnsptr($sourceip, ["extended_result" => true]);
if (isset($ptr["result"][0]))
    SetHELO($ptr["result"][0]); 

// In the post-delivery script
if ($errorcode >= 400)
    rate("delivery-failures", $senderdomain, 1000, 3600);

// In the MAIL FROM script
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
function Deliver() {
    // Override the deliver function
    global $apiurl, $senderdomain;
    // Use a more robust lookup like https://wiki.halon.io/API_calls
    $dkim = cache ["ttl" => 86400, "size"=> 32768, "ttl_override" => ["" => 60]]
        http("$apiurl/dkim/$1", ["timeout" => 10], [$senderdomain]);
    $dkim = json_decode($dkim);
    if (is_array($dkim))
        DKIMSign($dkim["selector"], $dkim["domain"], $dkim["rsakey"]);
    builtin Deliver();
}