13-Email IP/Domain Certification and Whitelisting Services for Bulk Email

by Anil Jalela | Jan 22, 2025 | Linux

Several companies and organizations provide IP/domain certification or whitelisting services to improve email deliverability for bulk email senders. Below is a detailed explanation of prominent services and programs, their features, and how they help email senders.

1. Return Path [Validity’s Sender Certification]

Return Path offers a certification program known as Return Path Certified IP (also called Sender Score Certified). This program ensures that email senders follow strict email-sending best practices. The certification process includes:

Reputation Checks: Verifying sender reputation.
Compliance Audits: Ensuring adherence to email laws and regulations.
Email Content Testing: Evaluating email formatting and content.
Once certified, emails sent from certified IPs enjoy higher inbox placement rates. This program is now operated by Validity.

2. Certified Senders Alliance (CSA)

The Certified Senders Alliance (CSA) is a European industry group that certifies email senders meeting their high standards for email practices. Key benefits include:
Recognition by European ISPs: CSA certification is widely accepted by major European mailbox providers.
Improved Inbox Placement: Certified emails are less likely to be marked as spam.
Certification involves meeting strict criteria and ongoing compliance monitoring.

3. Spamhaus Whitelist

Spamhaus provides a Whitelist Service that helps email senders improve their deliverability rates. Features include:
Reputation Checks: Ensuring senders have a strong email-sending reputation.
Whitelist Listing: Helps email reach recipients’ inboxes by bypassing some spam filters.
Senders must demonstrate compliance with email-sending standards and pass thorough reputation checks.

4. Cloudmark Sender Intelligence (CSI)

Cloudmark offers a reputation system called Cloudmark Sender Intelligence (CSI). It assigns a reputation score based on email-sending practices and sender behavior. Key points:
Score-Based Decisions: ISPs use CSI scores to decide whether to accept or block email traffic.
Ownership: Cloudmark was acquired by Proofpoint in 2017, and CSI now operates under Proofpoint.

5. Cisco Talos Intelligence (Formerly SenderBase)

Cisco’s Talos Intelligence provides a reputation score for email senders. This system evaluates:
Sending History: A sender’s historical practices.
Reputation Metrics: The quality of email traffic.
Talos Intelligence is used globally by ISPs and organizations for email filtering and blocking decisions.
Additional IP/Domain Certification and Reputation Services

Here is a list of other services that offer certification, reputation checks, or whitelisting for bulk email senders:

Discontinued Services
Some programs are no longer operational but were significant in shaping email certification and compliance:
GoodMail Systems CertifiedEmail: Shut down in February 2010.

Industry Associations and Groups
Organizations that promote email marketing best practices and compliance:

Other IP domain Listing Databases:-

IPV4_Black

IPV4_Reputation

IP4_Whitelist

IPV6_Black

IPV6_Reputation

IP6_Whitelist

Dom_Black

Dom_Reputation

Dom_Whitelist

Out_Of_Service

Summary

To participate in these certification programs, email senders must meet strict standards, such as adhering to best practices, maintaining low complaint rates, and complying with email laws and regulations (e.g., CAN-SPAM, GDPR). Once certified, senders experience improved deliverability, higher reputation scores, and reduced chances of being flagged as spam.

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