Blacklist in detail: IPv4

This internally used RBL is maintained by Schlund+Partner AG and 1&1 Internet AG to discover relay servers and block them.

The list is generated by active relay checks. When emails are received by this group the sender host is scheduled to be checked for being an open relay. attempts to relay a mail via this host and as soon as the mail is received at, the IP is added to the list as an open relay.

Last Accessed
2020-11-29 14:45 (UTC) 
Last Checked
When we last checked 3 days, 10 hours ago we found that it was not responding to queries. It was last working on 2020-11-26 06:21
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History for (Last 10 Days)

We keep some statistics on blacklists. Below is the graph for We test blacklists by asking them to respond to known IP's that are blacklisted and known IP's that can't be blacklisted. Not every blacklist has such IP's, we test them with what is possible. We keep if we get any response or error messages and the response duration. Lower response times are better. These statistics may be useful for email server administrators to pick which blacklist to use.

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