"favicon" v mail view-u v Protonmail: Kako nastavit?

Dobro jutro.

Evo, opazil sem, da se za nekatere maile v Protonmail interface-u ob mailu prikazuje ikona. Neke vrste favicon za mail.

Pogledal sem html source in ne najdem, da bi kje bil pointer na to ikono.

Ali kodo ve, kako ta tehnologija "prikaza ikone v mail view-u v Protonmail" (ter mogoče še v drugih klientih) dela?

Morda preko BIMI (Brand Indicators for Message Identification) mehanizma?

To see if a logo is coming from BIMI:
Open the email.
Click the three dots (︙) → "View headers".
Look for “Authentication-Results”, “DMARC”, and “BIMI-Location” fields.
If BIMI is used, there will be a link to an SVG logo file (usually ending in .svg).