This blocklist is no longer operational. DNS queries return NXDOMAIN. Remove from MTA configurations to avoid query timeouts.
What it is
FabelSources was a Dutch anti-spam project that maintained a DNSBL covering spam sources identified within the Dutch and European email environment. The project has been discontinued.
How it affects SMTP delivery
No impact. Remove bl.fabelsources.net from MTA and SpamAssassin configurations.
What causes a listing
N/A, defunct.
How to get removed
No removal necessary.
For the full reference catalog, see the email blocklist directory.
Delisting process in detail
The FabelSources blocklist targets observed spam sources. Delisting is handled through the operator’s portal. Response times are typically within 24-72 hours for well-documented requests. Automatic decay applies when the observed spam pattern stops. FabelSources is a smaller regional blocklist with focus on specific mail communities rather than global coverage.
Prevention practices
FabelSources prevention follows standard anti-abuse fundamentals: authenticated sending, disciplined list hygiene, complaint monitoring. Because FabelSources is a smaller blocklist, its impact is limited to receivers that specifically query it. Monitor FabelSources alongside major public blocklists for comprehensive coverage. Confirmed opt-in, prompt bounce suppression, and gradual IP warmup are the primary defenses against any spam-source blocklist listing.
Common listing causes
FabelSources listings correlate with observed spam sending. Common causes include purchased lists that hit FabelSources honeypots, compromised shared-hosting accounts, and coordinated spam campaigns. Because FabelSources operates a smaller network than major blocklists, listings often reflect specific abuse patterns rather than broad reputation issues, making them easier to identify and remediate.
Related blocklists
FabelSources operates alongside other regional and specialty blocklists in the broader anti-spam ecosystem. Enterprise reputation monitoring combines these smaller lists with major public blocklists (Spamhaus, Barracuda, SpamCop) for comprehensive coverage. Smaller blocklists sometimes serve as early-warning signals by reacting faster than consensus lists to emerging spam patterns.
About the Author
Alaa · LinkedIn
Email infrastructure specialist with 8+ years of hands-on experience in SMTP, deliverability, and email verification. I’ve configured and troubleshot mail systems across Postfix, Exchange, and cloud relays, managed IP reputation and warmup campaigns, and built verification pipelines processing millions of addresses. My work spans DNS authentication (SPF, DKIM, DMARC, BIMI), bounce handling, blocklist monitoring, and compliance frameworks including CAN-SPAM and GDPR. I write every article on SMTPedia to give email professionals, developers, and marketers the accurate, RFC-grounded reference they need.
About SMTPedia
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