The MTA for large-scale email services

Halon consolidates your email infrastructure, reducing risk and complexity. Halon makes email infrastructure scalable, simple to manage, rich in functionality and easy to evolve.

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Mailbox providers

Telcos, ISPs and hosting

Senders

Marketing and transactional

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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• 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 (!$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();
}