EmailValidly blocklist provider notes — reviewed 2026-09-06

Spamhaus ZEN / DBL: commercial public-checker access must be licensed or explicitly authorised. Public non-commercial mirrors are not queried. Configure authorised DQS credentials only after the licence covers public display, caching, stored history and paid monitoring.
https://www.spamhaus.org/blocklists/dnsbl-fair-use-policy/
https://www.spamhaus.com/data-access/real-time-dns-blocklists/

Barracuda BRBL: disabled until provider-authorised resolver access is configured and use by this service is confirmed. Official removal process:
https://www.barracudacentral.org/rbl/removal-request

SORBS: retired June 2024; no live DNS queries. Rows remain Unknown, never Clear based on an absent retired zone.
https://www.dnsbl.com/2024/06/status-of-dnsblsorbsnet-dead.html

SpamCop: DNS-based list. Access is self-tested before interpreting a negative result. Review conditions again before expanding query volume or commercial redistribution.
https://www.spamcop.net/bl.shtml

UCEPROTECT Level 1: DNS use for small/medium workloads, commercial use permitted. No automated queries are made to the operator's web lookup form. This service caches responses and limits request volume.
https://www.uceprotect.net/en/index.php?m=6&s=11
https://www.uceprotect.net/en/index.php?m=13&s=0

UCEPROTECT data licence:
Copyright © 2001-2021 UCEPROTECT-Network http://www.uceprotect.net
Permission to use, copy, modify, and/or distribute this data for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
THE DATA IS PROVIDED 'AS IS' AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS DATA INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS DATA.