Blacklist in detail:

ZapBL IPv4

ZapBL administrators describe ZapBL as a list of opinions as to where they do not want to receive mail from. An IP can get listed on this blacklist by means of spam received by the admins, spamtraps and chatchall addresses. The IP's can be manually added to the list but can also be automatically added after a review of the administrators.

Some IP's on this list will be automatically removed after some time has passed from the time the last spamming occured. Some IP's may only be removed manually and some could only be removed by the administrators. More information on removal can be found on the site.

Example Response Message
Listed in ZapBL, see
Last Accessed
2020-11-25 10:10 (UTC) 
Last Checked
When we last checked 2 hours, 23 minutes ago it was working.
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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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