Question 1

What is an email blacklist?

Accepted Answer

An email blacklist (or RBL - Realtime Blackhole List) is a database of IP addresses or domains that have been reported for sending spam. Email servers use these lists to filter incoming mail and block suspected spam sources.

Question 2

Why is my domain or IP blacklisted?

Accepted Answer

Common reasons include: sending spam (intentionally or via compromised accounts), high bounce rates from sending to invalid addresses, recipients marking your emails as spam, or your IP sharing space with spammers on shared hosting.

Question 3

How do I get delisted from a blacklist?

Accepted Answer

First, identify and fix the root cause (compromised account, bad list hygiene, etc.). Then visit the blacklist's website and follow their removal process. Most blacklists have an automated delisting form. Some lists automatically delist after a period of no spam activity.

Question 4

Which blacklists matter most?

Accepted Answer

Spamhaus (ZEN and DBL), Barracuda, and SpamCop have the highest impact because major email providers like Gmail, Microsoft 365, and Yahoo actively use them. Being listed on these will significantly hurt your deliverability.

Question 5

How often should I check for blacklisting?

Accepted Answer

Check proactively before major email campaigns and whenever you notice a drop in deliverability. If you send high volumes, consider weekly monitoring. For most businesses, checking monthly or when issues arise is sufficient.

Email Blacklist Checker

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