On Wed, 26 Jun 2024, Sebastian Nielsen wrote:
I wonder, which header should I set to show a profile picture in Microsoft Outlook (standalone client)?
As an aside: Which client, the old or the new? What works for one might not work for the other.
That I know of there's nothing. I'm not sure it would be wise to implement it via a header since anyone (e.g., scammers) might insert such a header -- you would probably filter them out but what about the millions of MTAs that wouldn't, whose operators haven't even heard of BIMI. Providing an image to display should be done only via the mail access protocol, and none have been officially extended to cover it as yet except those that are internal to the few mailbox providers that display them only within their webmail interface. If Microsoft ever does something odds are the image will only be available via their own protocols, or less likely they might have Outlook (probably new only) perform the message validation, BIMI DNS record lookup, and image (HTTPS fetch and) display.
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