Blacklist Check
Check whether your domain or IP address is listed on major spam blacklists (DNS-based blacklists).
What are blacklists (spam lists)?
DNSBL (DNS-based Blackhole Lists), also known as blacklists, are real-time databases that store IP addresses and domains identified as spam sources. Email servers check these lists before accepting emails - if the sender's IP or domain is on the list, the email may be rejected.
Why did you end up on a blacklist?
Most common reasons: sending to uncleaned lists with a high bounce rate, user complaints about spam, a virus-infected server sending spam, open relay configuration, or a large volume of emails from a new IP address without gradual warmup.
How to get removed from a blacklist?
Each blacklist has its own removal procedure. First, you need to resolve the issue that caused you to be listed, then request removal. Many lists automatically remove entries after a certain period if the problem is resolved.
Regular checking
It is recommended to regularly check your domain and IP addresses, especially if you send large email volumes. Being listed on a blacklist can drastically reduce your email delivery, and the sooner you notice it, the sooner you can take action.