Business email security

Protect your customers against the latest email-borne threats by offering a service that simplifies management and improves customer experience. Halon provides all you need to operate geographically localised, best-in-class and cost-effective secure email services.

Challenges and benefits

• Comprehensive threat protection. Not having a consolidated email security service makes oversight difficult, and can expose customers to security risks. Halon provides the latest in phishing, ransomware, spam and virus protection in a package that fits your entire customer base.
• Stronger data protection. Outsourcing email security outside certain jurisdictions can raise customer concerns regarding personal data protection. Halon enables you to offer geographically localised yet competitive and cost-effective email security services to your customers.
• Improved customer satisfaction. Email is business critical for many customers, yet it often takes long time to resolve email-related support issues. This is frustrating for customer as well as the support team. Halon's centralised track and trace makes it quick and easy to find any transaction, both on the sending and receiving side.

Built for system integrators

Fully multi-tenant solution for secure email services

• Email management

  Multi-tenant solution with a user-friendly interface for managing domains and users, with a fully customisable feature list. Advanced customer requests can be implemented with ease thanks to the Halon MTA's flexibility and powerful scripting.

• Best-in-class anti-spam

  Multi-tier filtering with phishing, ransonware, spam and virus protection from Cyren and Sophos, with support for many others. Ensuring full transaction safety, end customer can stop worrying about losing genuine email.

• Extensive logging and charts

  Easy-to-use, fullt multi-tenant message tracking and customisable charts makes it easy for end customers to get insight into your email security. It's built on Elasticsearch for speed, and comprehensive reporting and analysis capabilities.

• Latest encryption standards

  Eavesdropping on email should be a thing of the past. Halon supports the latest encryption standards such as MTA-STS, TLS-RPT, DANE, TLS 1.3 and S/MIME.

• Sign and authenticate

  Halon makes it easy to comply with the latest recommendations around authentication; including SPF, DKIM, DMARC and ARC.

• Highlight your brand

  Make sure that your customers feel at home. Apply your company's style using the cast branding capabilities, down to the color scheme.

More MTA features

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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• 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();
}