Apple mail doesn't load HTML signature
Two days ago I upgraded from macOS Catalina to Monterey.
My rich HTML signature (including remote images) no longer displays. The remote images are just boxes with question marks. This started happening right after my first boot into Monterey.
When I send them to recipients, the recipients DO see the images correctly. Therefore, something's just weird on my local computer (the one running Monterey).
I did check the Mail preferences > Privacy and made sure that Block All Remote Content is DISABLED. Images embedded in other mails (for example, mailing lists) do appear normally, so it's not that Mail is not loading remote images. It's ONLY my signatures.
I also checked the Mail preferences > Signatures and made sure that "Always match my default message font" is DISABLED, as is required for HTML signatures.
I also deleted my signatures and re-created them. Same issue. I even updated the embedded links (what used to be headshot.jpg. is now headshot2.jpg) and that didn't fix it.
I suspect that perhaps Mail is caching this somehow -- caching "broken" images, or being very lazy in going to get them. How can I fix this?
iMac Line (2012 and Later)