The general consensus is that displaying a logo in Yahoo Mail without DMARC and BIMI records is not reliably possible anymore. While Yahoo may have had legacy logo display programs or databases, these are outdated, unreliable, and no longer officially supported. BIMI (Brand Indicators for Message Identification) is the current recommended standard and requires DMARC compliance, specifically a policy of 'quarantine' or 'reject' enforced on both the parent domain and any subdomains. Proper email authentication and maintaining a good sender reputation are also essential for BIMI to work effectively.