Use blocklists at the initial point of setting up an email connection. You can reject emails immediately and significantly reduce the amount of processing required during content inspection.
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Not all blocklists are reactive. Our pro-active dataset of non-email emitting IPs (Policy Blocklist) helps some customers drop up to 70% of emails at the initial connection, before the HELO stage.
At the initial connection and SMTP transaction don't only use IP blocklists. Domain and Hash blocklists will provide increased protection. Domains can be listed before they're seen in the wild.
Related Resources
Busting Blocklist Myths
There are various comments bandied about with some regularity relating to Domain Name System Blocklists (DNSBLs). So, we thought it was about time to provide some truths when it comes to blocklists and dispel these myths.
BEST PRACTICE | DNSBLs and email filtering – how to get it right
Domain Name System Blocklists (DNSBLs) are a low-cost and effective way of stopping the torrent of inbound email traffic associated with spam and other malicious emails. There are multiple benefits to using blocklists, reducing infrastructure costs, and workforce hours to increasing catch rates. However, to get the most from DNSBLs, it’s vital to use them at the right points in your email filtering process.
Understanding the source code of a malicious email
When an end-user views an email, it isn’t always apparent if it’s malicious or not. However, if you look at the email’s source code, a wealth of information is revealed. By applying specific DNSBLs (blocklists) to a particular element of this source code, you can filter email with great success. But, before we discuss blocklists, you need to understand the anatomy of an email…
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WEBINAR ON-DEMAND | Advanced Email Filtering
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DNSBLs and email filtering - how to get it right
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Busting blocklist myths
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