Best Spam Filter for Business

The best spam filter for business is not necessarily the highest-rated, the top-seller or the least expensive. There are several different types of spam filter and several different ways in which they can be deployed. Some email filtering solutions are easy to implement and manage, whereas others have high maintenance overheads.

Indeed, a spam filter´s “ease of use” can determine how effective it is at detecting spam emails and email-borne threats. If a spam filter is too complicated to use, its settings can either be applied at too high a level – preventing the delivery of business-critical communications – or applied too low, weakening the business´s defense against spammers and cybercriminals.

One further consideration is the spam filter´s “granularity”. The best corporate spam filter must have the facility to apply different sets of filtering policies to different users. For example, a higher acceptable spam threshold should be applied to emails receive by a Finance Department than a Sales Department so as not to quarantine potential sales leads.

This article looks at the different types of spam filter and the deployment options available, and considers their pros and cons. It also highlights some of the key features you should be looking out for to ensure you select the best spam filter for business for your business´s specific circumstances.

Hardware, Software or Cloud-Based Solution?

Organizations evaluating the best spam filter for business have three choices – hardware appliances, software appliances and cloud based solutions. Due to the developments in technology, it is difficult to make a case for hardware spam filters. They usually have their own operating systems (requiring individual updates), lack scalability and can be difficult to manage for optimum performance.

Software appliances are more versatile and typically operate as a “gateway” between an organization´s firewall and its mail server. Usually compatible with every type of operating system, software appliances have fully automated updating, are scalable, and have simple end user spam management via a web-based interface.

Software appliances are suitable solutions for businesses that wish to keep their email security in-house. By keeping the spam filter and mail server on the premises, both can be protected by existing edge defenses such as firewalls and DMZs, as well as being integrated into existing IT policies and management processes.

A cloud based email filtering service is the best spam filter for business for SMEs who want to implement a spam filtering solution and then forget about it. The implementation of a cloud based email filter simply requires an adjustment to the mail exchanger record. Thereafter policies can be adjusted as necessary, but otherwise the email filter has minimal maintenance overheads.

The Deployment Options

The deployment options depend on the type of appliance selected. Hardware appliances have to be deployed within an organization´s physical environment, while virtual software appliances have to be installed within an organization´s operating system. Consequently, the only choice of deployment options exists when an organization feels a cloud based solution or part cloud based solution is the best spam filter for business.

Cloud based email filtering services are usually deployed in the service provider´s public cloud or in a private cloud. The main difference between a service provider´s public cloud and a private cloud is that the service provider will likely be proving a service for multiple businesses through their public cloud, whereas only your business´s email traffic will flow through the private cloud.

Private clouds are most suitable for large organizations and Managed Service Providers (MSPs) who want to channel all their client´s traffic through one dedicated area. However, if a large organization or MSP already has a private cloud, it should be possible for the best spam filter for business to be deployed within their own infrastructure.

The part cloud based solution (“hybrid solution”) allows businesses to adopt a multi-layered approach to email filtering. Often businesses will take advantage of a cloud based service to reduce the volume of spam reaching the mail server and the server´s own filter. As well as giving businesses an extra level of security, a hybrid solution can be the best email filtering service for businesses lacking high bandwidth Internet access.

Key Features of Email Filtering Solutions

Although most “standard” email platforms offer a degree of protection against spam emails and malware, they cannot compete with the increasing sophistication of spammers. 2% – 3% of unwanted or unsafe emails still avoid detection according to Microsoft Outlook´s Benoît Roumagère, and it only takes one click on one malicious URL for an entire network to be compromised.

Therefore, when evaluating email filtering solutions, the key feature is the percentage of spam emails and unsolicited emails containing malicious URLs the solution blocks at its optimal settings. The service provider of the best spam filter for business should demonstrate exceptionally high, verifiable levels of spam and virus detection. Thereafter, organizations should take the following into account:

  • How email identified as spam is treated – quarantined, deleted, or tagged and delivered.
  • The percentage of false positives – i.e. the number of genuine emails that get blocked.
  • The reporting options available to identify false positives and whitelist senders.
  • The front-end tests that are conducted to accelerate the filtering process.
  • The quality of the anti-virus software protecting the business from malware.
  • Whether a mail continuity service is provided in the event of downtime or server outage.

The best spam filter for business should offer organizations the choice of how email is treated and reported. It should provide outbound mail filtering and front-end tests by default – but offer organizations to options to customize these features – and have top-rated anti-virus software for maximum protection. A mail continuity service is essential.

Four Essentials that make the Best Email Filtering Service

Most email filters achieve their spam detection rates using mechanisms such as real-time block lists, Recipient Verification Protocols, Sender Policy Frameworks and a tool that allocates a Spam Confidence Level to each inbound email. In order to benefit from the best email filtering service, businesses should look for solutions that also offer the options of outbound mail scanning, Greylisting, phishing protection and malicious URL blocking.

Outbound Mail Scanning

Outbound mail scanning checks outbound mail for content that could be mistakenly identified as spam and for malware. As mentioned above, some email filters can be over-zealous and block mail for something as innocent as a misspelled title or the overuse of a spam-related keyword in the email content. Malware could be present in outbound mail if, for example, an employee had prepared a file on their malware-infested home computer and attached it to a company email.

If one your organization´s outbound emails is identified as being spam or containing malware, your organization´s IP address could be added to a real-time block list. This is a global blacklist of known spammers and their IP addresses against which every spam filter compares every inbound email. To have your emails blocked globally would harm the flow of communication between your business and your customers and potentially damage your credibility.

Greylisting

Whereas the real-time block lists contain the IP addresses of known spammers, Greylisting identifies spam from previously unknown sources. Greylisting does this by requesting emails are resent by the originating server. Usually the originating server will respond to the request within a matter of minutes, but a server sending spam emails will be too busy to respond, and the request effectively denied.

The reason why Greylisting is an essential feature of the best email filtering service for business is that the process eliminates spam from sources not included on real-time block lists and increases the spam detection rate from around 97% to close to 100%. It eliminates the 2% – 3% of unwanted or unsafe emails that avoid detection and keeps your inboxes virtually free from all types of spam. It is important to note not all premium spam filtering services include this feature.

Phishing Protection and Malicious URL Blocking

Phishing protection and malicious URL blocking are two elements of antivirus software that prevent the delivery of emails containing links to unsafe websites. These essential features of the best email filtering service for business help avoid scenarios in which employees divulge their login credentials to a cybercriminal or visit websites that start downloading malware automatically. Phishing protection and malicious URL blocking can also be configured to prevent employees visiting websites hiding their true identity behind a proxy server.

Phishing is one of the most serious online security threats in the current environment. A cybercriminal with an employee´s login credentials can use that information to steal or corrupt data. For an organization in a highly-regulated industry, the breach of security could result in large fines and civil action for the failure to implement adequate precautions against data theft or unauthorized exposure. Again, not all premium spam filtering services include this feature.

Ten Considerations for the Best Email Filtering Service
Ease of Use Email Continuity Service
Choice of Deployment Options Outbound Email Scanning
Detection Rate Greylisting Option
Accelerated Filtering Process Phishing Protection
Reporting Options Malicious URL Blocking
Anti-Virus Software Free Trial

SpamTitan: Delivering the Best Spam Filter for Business

SpamTitan´s granular email filtering solutions are built to be as versatile as your business needs and include the four essentials necessary to make a good email filtering service the best email filtering service. We offer a software option – “SpamTitan Gateway” – and a cloud-hosted option – “SpamTitan Cloud” – with the complete range of deployment options available.

On their optimum settings, both email filtering solutions block 99.97% of spam, phishing emails and spoofed emails. According to the leading independent testing and certification agency – VB Bulletin – SpamTitan Gateway and SpamTitan Cloud have a low false positive rating of just 0.03% without the need to activate dual spam filters as described in the hybrid solutions section above.

Both solutions offer businesses the choice of how they want spam email to be managed, scan outbound mail by default, and run front-end tests such as real-time block list checks, Sender Policy Framework, Recipient Verification, and SMTP Control Tests on inbound mail in a fraction of a second. The option to activate Greylisting also exists.

Double anti-virus protection with phishing protection and malicious URL blocking is provided by two of the leading anti-virus platforms – Bitdefender and Clam AV – and our easy-to-use service is supported by industry-leading customer and technical assistance. For more than five thousand customers, SpamTitan has already proven to be the best spam filtering service provider for business.

Speak with SpamTitan: The Best Spam Filtering Service Provider for Business

Speak with SpamTitan about your requirements and discover for yourself why our customers believe we are the best spam filtering service provider for business. Not only will our Sales technicians be able to guide you through the features and benefits of our spam filtering solutions, but you will also be invited to take advantage of a free trial of SpamTitan Gateway or SpamTitan Cloud – depending on which is the most suitable solution for your circumstances.

Our offer is for a fully-enabled spam filtering service with full customer and technical support, and the free trial should allow you plenty of time to experience the filtering service’s ease of use and to find the optimal settings for your specific requirements. Thereafter, should you choose to continue using SpamTitan to protect your network, no further configuration of our email filters will be required. Larger organizations should also ask about our API set for integration with back-end management software such as Active Directory and LDAP.

We also invite inquiries from Managed Service Providers (MSPs) and resellers about rebranding SpamTitan as an add-on product for their customers.

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