BIMI
Standard for displaying a brand logo next to your messages in email clients.
BIMI (Brand Indicators for Message Identification) is a relatively new standard (RFC drafts) that lets email clients (Gmail, Yahoo, Apple Mail) display your brand logo as an SVG next to your messages.
Requirements: 1. DMARC policy = quarantine or reject (not p=none). 2. SVG logo in SVG Tiny PS format, hosted over HTTPS. 3. TXT record default._bimi.yourdomain.com pointing at the logo URL and (optionally) a VMC certificate.
VMC (Verified Mark Certificate) is issued by commercial CAs (Entrust, DigiCert) and requires a registered trademark. Without VMC, only Apple Mail shows the logo; with VMC, Gmail and Yahoo show it too.
In Sendersy, BIMI is configured via the DNS page of the domain in the dashboard.