Summary
Setting up the Yahoo SenderHub Complaint Feedback Loop (CFL) involves aligning the DKIM domain with the domain used in the 'From' header and enrolling it in Sender Hub. BIMI logo display is not guaranteed, even with correct technical setup, and depends on factors such as the email client's support, recipient settings, and sender reputation. A DMARC policy of 'p=quarantine' or 'p=reject' is a prerequisite for BIMI. When sending from subdomains, ensure proper BIMI record inheritance or individual subdomain BIMI records. Always validate BIMI DNS records and SVG logos using BIMI validators. A properly formatted SVG logo and, optionally, a Verified Mark Certificate (VMC) are crucial for BIMI implementation. Various factors influence BIMI logo display, including rendering issues within email clients. SenderHub aids in monitoring complaints when DKIM is correctly set up. DMARC policy enforcement is essential for mailbox providers to trust implemented security measures against spoofing.
Key findings
- DKIM Alignment: The DKIM domain must match the domain enrolled in Sender Hub and the 'From' header domain for proper CFL functionality.
- BIMI Display Factors: BIMI logo display depends on email client support, recipient settings, sender reputation, and rendering issues.
- DMARC Requirement: BIMI requires a DMARC policy of 'p=quarantine' or 'p=reject' to function correctly.
- Subdomain BIMI Configuration: Subdomains need correctly inherited or individually configured BIMI records to display logos.
- BIMI Validation: BIMI validators are essential for checking DNS record and SVG logo configurations.
- SenderHub Monitoring: SenderHub helps monitor complaints, contingent on proper DKIM setup.
Key considerations
- Verify DKIM Alignment: Ensure DKIM alignment for effective CFL functioning.
- Account for External BIMI Factors: Recognize that factors beyond technical setup affect BIMI logo display.
- Implement Correct DMARC Policy: Implement 'p=quarantine' or 'p=reject' DMARC policy for BIMI eligibility.
- Handle Subdomain BIMI: Carefully manage BIMI records for subdomains, either through inheritance or direct configuration.
- Utilize BIMI Validators: Use validators to ensure correct BIMI DNS and SVG configurations.
- Maintain Sender Reputation: Focus on building and maintaining a strong sender reputation to increase BIMI display chances.
- Check SVG and VMC: Validate SVG format and consider obtaining a VMC.
- DNS record validation: Ensure your DNS records are valid using a BIMI validator.
What email marketers say
8 marketer opinions
Setting up the Yahoo SenderHub Complaint Feedback Loop (CFL) requires the DKIM signature domain to match the domain enrolled in Sender Hub for accurate complaint attribution. BIMI logo display, however, depends on several factors beyond just setup. Correct BIMI configuration involves a DNS TXT record, a properly formatted SVG logo (potentially with a Verified Mark Certificate - VMC), and a DMARC policy of 'p=quarantine' or 'p=reject'. The email client, sender reputation, and rendering issues can all impact logo visibility. Using BIMI validators to check DNS and SVG configurations, and aligning the DKIM domain with the envelope From domain (Return-Path) are crucial steps.
Key opinions
- DKIM Alignment: For Yahoo's CFL to work, the DKIM domain must match the enrolled domain in Sender Hub and align with the envelope From domain.
- BIMI Configuration: Correct BIMI setup includes a DNS TXT record, a valid SVG logo, and a DMARC policy (p=quarantine or p=reject).
- External Factors: BIMI logo display is influenced by the email client, sender reputation, and potential rendering issues.
- Validation: Using BIMI validators helps ensure correct DNS and SVG configurations.
- SenderHub Monitoring: SenderHub helps to monitor complaints when DKIM is correctly setup.
Key considerations
- DKIM Verification: Always verify DKIM alignment with the enrolled domain for the CFL to function correctly.
- BIMI SVG Validity: Ensure your SVG logo is correctly formatted, publicly accessible, and meets BIMI specifications; validate it.
- VMC Consideration: Consider obtaining a VMC for increased trust, although logo display isn't guaranteed even with one.
- DMARC Policy: Implement a DMARC policy of 'p=quarantine' or 'p=reject' as it's a prerequisite for BIMI.
- Email Client Variability: Understand that BIMI logo display varies across email clients and is outside the sender's direct control.
- Reputation Importance: Maintain a positive sender reputation, as this can influence BIMI logo display.
- DNS Validation: Ensure your DNS records are valid using a BIMI validator.
Marketer view
Email marketer from Reddit shares that if your BIMI logo isn't showing, double-check your SVG file. Ensure it's correctly formatted, publicly accessible, and meets all the BIMI specification requirements. Also, verify that your VMC (if used) is valid.
15 Aug 2022 - Reddit
Marketer view
Email marketer from GMass shares that SenderHub helps to monitor complaints. Ensuring that your DKIM is setup correctly allows the feedback loop to function correctly.
1 Aug 2021 - GMass
What the experts say
6 expert opinions
Setting up the Yahoo SenderHub Complaint Feedback Loop (CFL) requires a direct match between the DKIM domain and the domain enrolled in the CFL. BIMI logo display is not guaranteed even with correct technical setup and depends on factors like the email client's decision and sender reputation. Subdomains may not inherit the BIMI logo due to the `sp=none` tag. When sending from subdomains, ensure they either inherit the BIMI record correctly or have their own. Use a BIMI validator after publishing the BIMI record to diagnose common mistakes.
Key opinions
- DKIM Domain Match: The DKIM domain must directly match the domain enrolled in the Yahoo SenderHub CFL.
- BIMI Display Uncertainty: BIMI logo display is not guaranteed, even with correct setup, due to factors beyond sender control, such as email client decisions and reputation.
- Subdomain BIMI Inheritance: Subdomains may not inherit the BIMI logo because of the `sp=none` tag affecting DMARC policy.
- Subdomain BIMI Configuration: If sending from subdomains, ensure they inherit the organizational BIMI record correctly or have their own BIMI record.
- BIMI Validation: Use a BIMI validator after publishing the BIMI record to check for common mistakes.
Key considerations
- Enrolling DKIM Domain: Enroll the DKIM domain in the CFL for the easiest path.
- Sender Reputation: Maintain a high sender reputation to increase the likelihood of BIMI logo display.
- DMARC Policy: Be aware of the implications of the `sp=none` tag on subdomain DMARC policy and BIMI inheritance.
- Subdomain-Specific BIMI: If using subdomains, ensure each has its own properly configured BIMI record or correctly inherits from the organizational domain.
- BIMI Testing: Always test your BIMI record with a validator to identify and correct configuration errors.
Expert view
Expert from Email Geeks confirms that marketing.notcutts.co.uk *is* a subdomain of notcutts.co.uk and that the sp=none tag indicates that any subdomains of marketing.notcutts.co.uk have a DMARC policy of none.
27 May 2023 - Email Geeks
Expert view
Expert from Email Geeks explains that there needs to be a direct match with the DKIM domain for the Yahoo SenderHub Complaint Feedback Loop (CFL). Recommends enrolling the DKIM domain (cd.marketing.nocutts.co.uk) in the CFL for the easiest path.
27 Nov 2023 - Email Geeks
What the documentation says
5 technical articles
Setting up Yahoo Sender Hub CFL requires DKIM domain alignment with the 'From' header domain. BIMI logo display depends on factors like email client support, recipient settings, and sender reputation, even with correct setup. Crucially, BIMI requires DMARC compliance with 'p=quarantine' or 'p=reject' policies to verify sender authenticity and prevent spoofing. DMARC enforcement enables mailbox providers to trust implemented security measures. BIMI works in conjunction with DMARC for authentication, requiring best practices with BIMI records, SVG images, and DMARC.
Key findings
- DKIM Alignment for CFL: Yahoo Sender Hub CFL requires DKIM domain aligned with the 'From' header domain for feedback association.
- BIMI Display Factors: BIMI logo display is subject to email client support, recipient settings, and sender reputation, besides correct setup.
- DMARC Requirement for BIMI: BIMI mandates DMARC compliance with a 'p=quarantine' or 'p=reject' policy for proper functioning.
- DMARC and Trust: DMARC policy enforcement is essential for mailbox providers to trust sender's security measures against spoofing.
- Comprehensive BIMI Setup: BIMI operates with DMARC, requiring best practices in BIMI records, SVG images, and DMARC configuration.
Key considerations
- Verify DKIM Alignment: Ensure the DKIM domain matches the 'From' header domain to use Yahoo Sender Hub CFL effectively.
- Address BIMI Display Limitations: Recognize that BIMI logo visibility depends on factors beyond your control, such as email client support.
- Implement DMARC Policy: Implement and enforce a DMARC policy of 'p=quarantine' or 'p=reject' as a prerequisite for BIMI to work.
- Optimize BIMI Records and Images: Follow best practices in creating and maintaining BIMI records and SVG images.
- Prioritize Sender Reputation: Focus on building and maintaining a good sender reputation to increase BIMI logo display likelihood.
Technical article
Documentation from DMARC.org emphasizes that BIMI requires a DMARC policy of 'p=quarantine' or 'p=reject'. The BIMI logo will not display if the DMARC policy is set to 'p=none'. This is because BIMI relies on DMARC to verify the sender's authenticity and prevent spoofing.
12 Jul 2021 - DMARC.org
Technical article
Documentation from RFC explains that DMARC policy enforcement (p=quarantine/reject) is crucial for BIMI, as it provides a mechanism for mailbox providers to trust that the sending domain has implemented security measures to prevent email spoofing.
3 Dec 2022 - RFC
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