Anti Spam Email System

For the best possible cybersecurity systems you should install an anti spam email system that works well with your installed email service, and the free security provisions it comes with.

Doing so will bolster spam detection rates to around 100%, free security measure typically register detection rates of around 97%, This may not seem like much of a difference but when applied to a large company or group that is sent hundreds of thousands of emails every day the 2% difference can result in thousands of spam email making it to the email inboxes of your staff.

There is also a risk that, as you attempt to increase your acceptable spam thresholds in a bid to eradicate the issue completely, your solution will be so sensitive that it rejects emails that are genuine and may even be from an important client or a potential customer, However, an anti spam email system can be put in place that tackle the spam, keeps the detection rate high and recognises genuine emails from spam ones.

Acceptable Spam Thresholds Explained

Acceptable spam thresholds can be hard to set correctly. Set the thresholds too low, and the business is inundated with spam. Set the thresholds too high and important company emails are rejected by mistake in error and have to be manually delivered by system managers.

More difficulties spring up[ if one department or staff members needs a different acceptable spam threshold from another. Finance departments may want a high threshold to safeguard staff from spoofed email, but this could create concerns from sales departments about the timely sending of sales leads.

An email anti spam service can get around this problem by allowing administrators to apply different acceptable spam thresholds to different groups of staff. Indeed, different thresholds can be applied to individuals if need be, and the process is made easy by having the facility to integrate spam detecting services with directory tools such as Active Directory and LDAP.


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Along with the integration facility, each business’s email anti spam service is managed using a centralized administration portal. Administrators can change acceptable threshold levels, whitelist or blacklist senders, and control web authentication settings with the click of a mouse. Once the optimal settings have been created, an email anti spam service is a set and forget solution to spam emails.

How can this be addressed? First of all typical anti spam measures such as RBL and SURBL filters and recipient verification are put in place. Bayesian analysis, the system that scores the extent of spam threat contained in each email to decide whether to deny it or allow it through, is then deployed.

All of these methods play an important part in blocking spam that is being sent from an originating point that is recognised as a normal Whereas RBL and SURBL filters are good at detecting emails from known sources of spam. While they are a welcome and necessary tool in the war against cybercrime , they are not a sufficient defence on their own. You will need a tool that can block spam that comes from an unknown source. This is where greylisting is crucial.

With greylisting all inbound emails are rejected, at first, and sent back to their originating mail server with a request for them to be sent again. Spam mail servers are usually too busy to notice a request like this and it is never sent again so the IP address is added to the blocked list on your filter. Similarly emails that are genuine and re-sent will be marked as being from authentic senders and can be placed on your whitelist so they will not be subject to the same checks again.

An Anti spam email system will also use measures including antivirus software, the Sender Policy Framework protocol and HELO tests to tackle all of the spam coming onto your email server. When all of these measures are combined that can result in a spam detection rate of around 99.9%.