What it is
The IVM blacklists are maintained by an email security provider in South Africa. The family includes an IP zone (long-term spam sources), a 24-hour rolling zone (recent spam activity), and a URI zone (domains in spam message bodies). They are primarily used by mail servers in Africa and some regional ISPs.
How it affects SMTP delivery
IVM zones are used as spam scoring inputs rather than hard-block sources in most configurations. They have limited deployment outside the African region.
What causes a listing
Listings occur from spam detected by IVM's trap network or reported by IVM network participants.
How to get removed
Contact IVM via the lookup tool at www.ivm.co.za to submit a removal request.
For the full reference catalog, see the email blocklist directory.
Delisting process in detail
IVMSIP (bl.ivmSIP.junkemailfilter.com) is operated by Invaluement, which sells commercial spam-filtering data. Delisting requires contacting Invaluement through their portal and providing sender authentication details plus remediation documentation. Invaluement responds within 24-48 hours for well-documented requests. Because IVMSIP is a commercial data feed, delisting policies are more structured than volunteer-operated blocklists: expect formal review and documented remediation requirements.
Prevention practices
Invaluement’s data collection methodology combines honeypot networks, customer telemetry, and pattern analysis. Prevention requires the fundamentals plus attention to sending patterns that trigger their algorithms: gradual IP warmup, consistent volume, low complaint rates, and clean list hygiene. Enterprise senders reaching corporate environments should monitor IVMSIP specifically because Invaluement’s data feeds into several commercial anti-spam appliances used by enterprise customers.
Common listing causes
IVMSIP listings correlate with observed spam patterns detected by Invaluement’s honeypot network. Compromised shared-hosting accounts, purchased lists that hit their traps, and volume spikes without warmup are the primary causes. Because Invaluement operates a global honeypot network, the coverage is broad enough that purchased lists frequently hit their traps within the first send. Legitimate senders should avoid any list acquisition strategy that involves harvested or scraped addresses.
Related blocklists
Invaluement operates multiple products beyond IVMSIP, including domain-based lists and enterprise threat intelligence feeds. IVMSIP data feeds several commercial anti-spam appliances, so an IVMSIP listing has downstream impact beyond direct queries against the blocklist. Enterprise reputation monitoring typically includes IVMSIP alongside Spamhaus, Barracuda, and other major blocklists for comprehensive coverage of the commercial anti-spam ecosystem.
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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