Category: Blog


Halon invites you – Free Hotel and Conference

World Hosting Days USA is not far off. Have you registered? If not – good for you because we would like to treat you… Halon invites you to attend the World Hosting Days on the 19th – 20th of May in Seven Spring Ski & Mountain Resort outside Pittsburgh, Pennsylvania.

We will simply pick up you hotel accommodation cost for 1 night and your conference fee at a value of approx $600. All you have to do is to get in touch for your unique voucher code, register online and travel.

  1. Email Us!
    Get your unique voucher code for your free (1) night at the conference hotel
  2. Register Online!
    Use our unique link to visit WHD registration page or simply add Halon voucher code LXX88BQ upon registering to get your conference fee for free.
  3. Use your hotel voucher code!
    Add your details to register and don’t forget to use the code we gave you when you book your hotel – it’s unique and works only once.

All set! Oh, and don’t forget to book your travels…


WHD has the tendency to choose the most fantastic venues and the conference is as always packed with tremendous varieties of networking activities, social gatherings and educational sessions with top industry leaders. Well worth the travels – we promise!

Don’t miss out the social gatherings in the evenings, which starts already on the 18th of May. Halon Security is the proud sponsors of the bar for the whole event at the Bavarian Lounge. Step by and have a drink with us!
During the day you’ll find us in our booth #17

We are looking forward to seeing you – and help us spread the word – 1 Hotel night and World Hosting Days US conference – FOR FREE!

Please read the T&CFree hotel: Only applicable for non-exhibitors/partners. Only one hotel night for free per person and the code only works when you register with Halon Conference voucher code: LXX88BQ. Pleases note Halon Security only distributes voucher codes as a third party and is not responsible for your hotel booking nor for any failures in applying the code. Halon Security cannot be held responsible for any additional costs or for complete occupancy of the hotel. The free hotel night only includes accommodation for 1 night and any additional costs will be your own responsibility. No refunds are applied. By registering to WHD conference using Halon voucher codes you have agreed to these terms and WorldHostingDays general terms. For any further questions regarding the conference, travel and accommodation please visit

Fight outbound spam and increase deliverability

Many email providers such as web hosts, ESPs and even VPS providers are familiar with the consequences of being blacklisted; angry customers calling the support because of delayed or reject email, countless of hours tracking down abusive users and patiently trying to get of the blacklists.

Unlike many other anti-spam products marketing themselves as “turn-key” solutions, Halon provides a scriptable email gateway that works as a toolbox for hosting providers. It enables them to tailor the system to fit them perfectly using our high-level scripting language. For example, you can in a programmable fashion create rate limits of anything you like. If you can identify customers based on their sender domain (enforced by the sending email server), you can defer messages based on the customer’s current deliverability statistics such as script such as

if (rate("delivery-failures", $senderdomain, 0, 3600) > 999)
    Defer("$senderdomain has more than 1000 failed deliveries during the last hour");
if (GetMailQueueMetric(["filter" => [ "senderdomain" => $senderdomain ]]) > 500)
    Defer("$senderdomain has exeeded the max queue limit of 500 messages");

Although quite different from inbound spam, filtering outbound spam can be extremely effective with the right tools, because you know who the sender is. In order to create a maintenance-free system, you can even allow a low rate of spam (per customer) sail through, to minimise the impact of false positives.

There are however many other factors that can be weighted into the equation. We have compiled a short list of the most common and effective methods to combat outbound spam which includes (but isn’t limited to);

Most of what we’ve discussed here works equally good in a fully transparent proxy installation, suitable for VPS providers that (for whatever reason) have chosen not to enforce the usage of an SMTP relay.