Impressionwise Email Verification and Spam Trap Removal

Threat Intelligence Center

URI Advisories

Short for Uniform Resource Identifier Blacklist”., is a company/ website that produces a list of domain names observed sending spam or other undesired email content.

As subscribers to the URI advisory, ISPs and companies will know from which domain names appearing in the email from which to block traffic. Most traffic blocking occurs during the SMTP connection phase. The receiving end will check the URI for the connecting or sender domain name. If the domain name matches one on the list, then the connection gets dropped before accepting any traffic from that email sender.

For a complete understanding of the blacklisting process and how it can affect your email delivery as well as your sender reputation, see our Understanding Email Blacklisting help doc.

The various URI’s have different policies yet generally encompass the three major points:

  • Goals. What does the URIBL seek to list? Is it a list of open-relay mail servers or open proxies – or of IP addresses known to send spam – or perhaps of IP addresses belonging to ISPs that harbor spammers?
  • Nomination. How does the DNSBL discover addresses to list? Does it use nominations submitted by users? Spam-trap addresses or honeypots?
  • Listing lifetime. How long does a listing last? Are they automatically expired, or only removed manually? What can the operator of a listed host do to have it delisted?

Impressionwise maintains the largest most complete knowledgebase of known anti-spam, URI or domain-based blacklists that can affect your online sending reputation and deliverability of your emails.

Highlights include detailed information for each site:

  • Site name and description
  • Threat-level
  • Nomination process
  • Listing lifetime
  • Delisting guidance

Blacklist profiles

To view our knowledgebase of known anti-spam, URI or domain-based blacklist profile select from one of the following below. Reputation Services DNSBL
Hostkarma DNSBL
Improware Swinog DNSBL
Invalument DNSBL DNSBL
SARBL - Smart Adaptative Realtime URIBL
Scientific Spam DNSBL
Spam Eating Monkey
Suomispam Reputation Database
SURBL URI Reputation Data
The 0Spam (Zero Spam) Project
The Spamhaus Block List
Tiopan Blacklist

For additional guidance or any questions you may have, please contact us.

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