Will BIMI work on multiple levels of subdomains?
Summary
What email marketers say8Marketer opinions
Email marketer from ValiMail.com (now Agari) mentions that while BIMI primarily works at the organizational domain level, it can be configured for subdomains. Each subdomain requires its own BIMI record and corresponding VMC validation.
Email marketer from DMARC Analyzer explains that BIMI can be implemented on subdomains, but each subdomain requires its own distinct BIMI DNS record. This involves setting up the appropriate TXT record for BIMI on each subdomain and ensuring that the VMC covers each domain that you want to use BIMI on.
Email marketer from ZeroBounce mentions that BIMI is compatible with subdomains, provided you correctly configure the DNS records for each subdomain. You must also ensure that your Verified Mark Certificate (VMC) is valid for the specific subdomains you are using.
Email marketer from OnlyDomains.com states that BIMI can function with subdomains, provided the DNS records for BIMI are correctly configured for each specific subdomain and that the VMC covers these subdomains. Proper configuration is essential for the logo to display correctly across different subdomain levels.
Email marketer from EmailVendorSelection shares that for BIMI to work across subdomains, each subdomain needs its own individual BIMI DNS record and the VMC must be valid for that specific subdomain. Failing to do so will result in the logo not being displayed.
Email marketer from Reddit explains that BIMI will work on multiple subdomain levels if each subdomain has its own BIMI record and the VMC is valid for each. You can't just set it up for the top-level domain and expect it to cascade down.
Marketer from Email Geeks explains that a BIMI record has to be published at the RFC5322.From domain or the org domain of the From domain. He further clarifies that if a BIMI record is published at sample.com, it will work for email.xyz.sample.com, depending on the domains listed in the VMC.
Email marketer from StackOverflow explains that BIMI logo may not show on subdomains due to DNS configuration problems. Requires checking if the BIMI record is correctly set up for each subdomain. It is crucial to ensure DNS records are valid for each subdomain where the BIMI logo should appear.
What the experts say1Expert opinion
Expert from Word to the Wise explains that BIMI should work on subdomains if properly configured with the corresponding DNS records and VMC validation for each subdomain.
What the documentation says3Technical articles
Documentation from the BIMI Group specifies that the domain in the BIMI DNS record must match the 'From:' domain in the email. This applies to subdomains as well; each subdomain must have its own BIMI record if it sends emails independently.
Documentation from DigiCert explains that BIMI needs a Verified Mark Certificate (VMC) that must list the domain or subdomain in the Subject Alternative Name (SAN) field. If you want BIMI to work on subdomains, ensure the VMC covers those specific subdomains.
Documentation from Entrust.com explains that BIMI can work with subdomains, but the VMC (Verified Mark Certificate) must include the relevant domain and subdomains covered by the BIMI record. Each subdomain intended to display the BIMI logo needs to be explicitly listed within the certificate.