The MTA for large-scale email services

Halon offers a flexible security and operations platform for email in transit.

If you run large scale email services, Halon MTA will make you more competitive. This, 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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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();
}