The Spamhaus lookup tool of our [Blocklist Removal Center](https://check.spamhaus.org/) page will show IPs and domains that are currently listed in one or more of Spamhaus’s blocklists.
If the IP or domain you are checking is not found, but you are blocked, there are two possibilities:
1. It can be a DNS resolver issue. More information can be found [here](https://www.spamhaus.com/product/help-for-spamhaus-public-mirror-users/).
2. If the IP or domain was listed by Spamhaus, and was recently removed: it takes some networks longer to catch up than others. In this case, wait 1-2 hours and the problem should clear by itself. In rare cases when a specific network is having problems syncing updates from Spamhaus, this can take hours or days.
**NOTE**: If the issue with sending mail persists after removal, check to see if it is a problem with “all networks” or “just one or two”. If it’s just one or two, the issue lies with the network being sent to. Please contact them. If it is “all networks”, please update your removal ticket with details.