[enhancement]: serving BIMI certificates or svg files

[rcfa]

Which feature or improvement would you like to request?

While one can legitimately argue that BIMI as a security feature is broken, it’s not necessarily broken from a marketing/corporate ID/visual point of view.

Some mail clients support, in addition to the "checkmark" BIMI certificates, also simple, unverified svg files, which make mailboxes visually more appealing and easier to navigate

Given that Stalwart has already a built-in web server, and has WebDAV/CardDAV/CalDAV on its road map, it would be nice if it had the ability to anonymously serve some small static files, such as the pem or svg files required for BIMI display on mail clients.

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[williamdes]

Ref: #465 - support BIMI

[rcfa]

I frankly don’t care about BIMI support, I care about serving some e-mail related images.
I might as well have a standard signature file with a company logo, that gets attached to each e-mail, and it would be great if such small, limited number of fixed resources could be served directly by Stalwart, rather than having to set up a separate web server.

Ideally, eventually the industry can come up with a standard along the X-Face, Face or X-Image-URL headers...