Which email blacklists are most important to monitor for deliverability issues?

Email marketer from Mailjet shares that Spamhaus is a key blacklist to monitor. They also recommend checking against Proofpoint and Barracuda Reputation Block List, as these are commonly used by corporate filters and can significantly impact deliverability to business addresses.

Email marketer from Reddit recommends checking Spamhaus, Barracuda, and URIBL. They also noted that small, less-known blacklists can sometimes cause issues with specific recipients, so it's beneficial to monitor those as well if you have deliverability problems to a particular domain.

Email marketer from Sender Score shares that your sender reputation directly affects your deliverability. They recommend keeping a high sender score and monitor for changes in your IP reputation.

Email marketer from Email Marketing Forum suggests focusing on Spamhaus and Barracuda, as these are widely used. Additionally, they advise monitoring your sending reputation with major mailbox providers like Gmail and Outlook, as their internal metrics heavily influence deliverability.

Email marketer from ZeroBounce emphasizes the importance of maintaining a clean email list to avoid blacklists. They recommend regularly cleaning your email list to remove invalid or inactive emails.

Email marketer from Email Geeks shares that there's no general answer to 'which RBLs are important?' It depends on who you're sending emails to. Even a badly maintained RBL is important if it blocks you from reaching a significant portion of your audience. Some RBLs, like Spamhaus, are generally important. Even unimportant RBLs can help identify misbehaving clients on shared IPs.

Email marketer from Validity shares that your sender reputation is essential for high deliverability. Validity focuses on data quality and email infrastructure. Although they don't offer a direct blacklist, ensuring your data and infrastructure are sound prevents deliverability issues.

Email marketer from GlockApps shares that Spamhaus, Barracuda, and SORBS are important blacklists to monitor. GlockApps is a tool that has functionality to monitor various lists and provides reporting on deliverability.

Expert from Email Geeks explains that most blacklists are worthless because it's trivial to run one. Running a useful reputation service with accurate data used by many inboxes is much harder. Relevant ones are Spamhaus, Barracuda, and maybe Spamcop. Being listed on others might signal potential problems but won't cause immediate delivery issues. If you have rejection messages, they tell you what you need to know; otherwise, there isn't really a problem.

Expert from Word to the Wise (Laura Atkins) explains that rather than focusing solely on specific blacklists, it's crucial to understand your overall IP reputation and how mailbox providers view your sending practices. Monitoring engagement metrics and feedback loops is important.

Expert from SpamResource responds that focusing on a few key blacklists, such as Spamhaus, is more effective than trying to monitor every single one. These widely used lists have the greatest impact on deliverability.

Documentation from Barracuda explains that the Barracuda Reputation Block List (BRBL) is a real-time database of IP addresses with a poor reputation due to spamming activities. Inclusion on this list can significantly impact email delivery to organizations using Barracuda's email security solutions.

Documentation from Spamhaus.org explains that Spamhaus maintains several blocklists, including the SBL (Spamhaus Block List), which lists IP addresses involved in direct spam activities, and the ZEN list, a combination of SBL, XBL (Exploit Block List), and PBL (Policy Block List) offering comprehensive coverage. These lists are widely used by email servers to filter out spam.

Documentation from Microsoft explains that they use their own internal lists and also factors from external reputation systems. Although the specific lists are not published, senders should monitor deliverability to Outlook.com and follow best practices to avoid being flagged by their filters. Sender reputation is crucial.

Documentation from Proofpoint explains that they maintain their own internal reputation system and blacklist based on various factors, including spam traps, user complaints, and sending patterns. Their reputation data significantly impacts email delivery to organizations using Proofpoint's email security services.