This blocklist is no longer operational. DNS queries return NXDOMAIN. Remove from MTA configurations to avoid query timeouts.
What it is
CALIVENT was a blocklist project targeting IPs sending malware via email. The project has been discontinued.
How it affects SMTP delivery
No impact. Remove from 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 Calivent blocklist targets observed spam sources. Delisting is handled through the operator’s contact form. Response times are typically within 24-72 hours for well-documented requests. Automatic decay applies when the observed spam pattern stops. Calivent is a smaller specialty blocklist with limited global deployment.
Prevention practices
Calivent prevention follows standard anti-abuse fundamentals: authenticated sending (SPF, DKIM, DMARC), disciplined list hygiene, complaint monitoring. Because Calivent is a smaller blocklist, its impact is limited to receivers that specifically query it. Monitor Calivent alongside major public blocklists for comprehensive coverage. Confirmed opt-in and gradual IP warmup remain the primary defenses.
Common listing causes
Calivent listings correlate with observed spam patterns from the listed IP. Common causes include purchased lists that hit Calivent honeypots, compromised shared-hosting accounts, and coordinated spam campaigns. Because Calivent operates a smaller honeypot network, listings often reflect specific abuse patterns rather than broad reputation problems.
Related blocklists
Calivent operates alongside other specialty blocklists. Enterprise reputation monitoring combines Calivent with major public blocklists (Spamhaus, Barracuda, SpamCop) for comprehensive coverage. For most senders, the major public blocklists provide sufficient signal; smaller lists like Calivent matter when specific receiver populations query them directly.
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
SMTPedia is an independent email industry reference covering SMTP, IMAP, POP3, email deliverability, marketing platforms, DNS authentication, and email verification. Every article is researched from official provider documentation, IETF RFCs, and industry best practices. Settings and configurations are verified quarterly.
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