macOS Monterey: Remove Attachments is grayed out in Mail
My old Mac never had this problem, but my new Monterey MacBook Pro does: I can't Remove Attachments on any mail I receive.
FWIW: I use POP (deleting from server). I have tried Rebuilding mailboxes, as well as moving offending messages to different boxes. (Size of attachment makes no difference. Nor does whether I have saved the attachment or not.)
Two situations where I CAN still Remove Attachments:
• From outgoing messages I send, sitting in my Sent box. In fact, if I forward an offending message back to myself, the version in my Sent box gains the ability to Remove Attachments (leaving a weird small 100kb attachment I can live with). But the received copy still can't do it.
• Old messages imported (as mbox files) into my Inbox from my ancient Mac running an old version of Mail. Remove Attachments is fine for old messages—I just can do it for any NEW arrivals on this machine. (Same email account worked fine on the old Mac I just switched from.)
Sounds like this may be an issue going back years... since Mojave maybe? Has any solution emerged? TIA!