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Frequently Asked Questions

What is an email blocklist?

A DNS real-time blocklist (blacklist) lists “items” seen in unsafe DNS traffic. In real-time, blocklists are used in network security architecture to mitigate API, DNS, communication, email, and identity abuse. Systems that use blocklists include directory servers, DNS servers, firewalls, gateways, messaging servers, and web proxies.

Who should use a DNSRBL email blocklist?

Anyone who operates an on-premise mail server or uses a single-tenant 3rd party cloud email service will benefit from our plug-and-play DNS email blocklists.

By using a well-designed DNS email blocklist suite, email servers can reject unsafe messages as quickly as the unsafe DNS resources have been identified, thereby saving processing overhead, maximizing user mailbox safety, and identifying compromised users and bad actors on the platform.

How can Abusix Mail Intelligence benefit me if I already have an existing email security solution?

Abusix Mail Intelligence catches more than 99.6% of incoming malicious traffic during the initial inbound connection in less than a second. As your mail servers' first layer of defense, you protect your users from most spam, scams, phishing, and malware. Additionally, Abusix Mail Intelligence; - Saves CPU overhead, providing significant scaling gains - Decreases hardware requirements - Integrates with most email servers, spam filters, and security solutions.

I’m using Google Workspace or Microsoft 365. Can I use a DNS email blocklist?

Yes, if you run an email gateway in front of either Google Workspace or Microsoft 365 with your domain MX records pointing to these gateways, you may use blocklists upstream of Google or Microsoft.

Should I use more than one blocklist?

Yes, the more accurate, reliable, and well-supported email filtering, the better.

If you are considering switching vendors but are still unsure, take a look at our Comparison Tool Overview to let you compare our effectiveness.

Are DNSRBL email blocklists used on inbound email?

Yes, a DNS email blocklist suite used with your inbound mail server will block bot traffic, spam, phishing, and malware from reaching your users by bouncing more than 99.6% of the malicious traffic before it reaches your content filtering stage. In addition, real-time lists within the suite will help your content filters recognize other content, such as domains used in URLs and short and disk storage URLs that change regularly.

By bouncing spam, phishing, and malware already identified in DNS early in the message receipt lifecycle, your mail server resource overhead, storage, and user risk is reduced. Furthermore, by removing the general messaging noise, you can focus your content filtering efforts on identifying more precisely targeted malicious message content targeted at your organization and its users.

Abusix Mail Intelligence blocks inbound mail during the (a) TCP/IP connection, (b) smtp session, and (c) content evaluation cycle. Using Abusix Mail Intelligence, Mailbox Providers can dramatically reduce user security risks and messaging overhead.

Are DNSRBL email blocklists used on outbound email?

Yes, a DNS email blocklist suite used with your outbound mail server will help you identify users with compromised systems early during the authentication stage of sending emails. In addition, the real-time DNS lists will also help your outbound email server recognize domains, short URLs, and disk storage resources associated with compromised accounts and bad actors, reducing the likelihood your mail server will become blocklisted.

By identifying users associated with compromised systems and accounts, you can issue an immediate password reset to the user and warn them of the hazard on their machine, thereby preventing bots from using the user's password and malicious email. If the user is a bad actor, they will tire from resets and move on to other resources. Additionally, you reduce the likelihood that your server will be blocklisted for these users.

Abusix Mail Intelligence blocks outbound mail during the (a) Auth session and (b) content evaluation cycle. Using Abusix Mail Intelligence, Mailbox providers can dramatically reduce compromised accounts and blocklistings.

What lists does the Abusix Mail Intelligence blocklist suite contain?

The Abusix Mail Intelligence DNS blocklist suite contains twelve Production and four Beta Zones (or lists). Each list is optimized for its specific use in inbound or outbound email and during a different stage of the messaging lifecycle (connection, auth, smtp dialog, and content evaluation).

see Production Zones and Beta Zones

What standards does Abusix Mail Intelligence follow?

Abusix follows the IETF standard RFC-5782 “DNS Blacklists and Whitelists” and M3AAWG “Best Current Practices For Building and Operating a Spamtrap”.

Can I try Abusix Mail Intelligence?

Of course! - just go to https://abusix.com/free-trial/ and sign-up for a free 14-day trial.

Can we have a local mirror of the Abusix Mail Intelligence blocklist suite via RSYNC?

Yes, we only provide RSYNC at an additional fee to large mailbox providers.

If you are interested in using RSYNC, please get in touch with us during your trial at support@abusix.com

Learn more about Abusix Mail Intelligence


Still, need help?

No problem; click the chat button in the bottom right-hand corner of the screen and send us your questions. Alternatively, you can email us at support@abusix.com


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