I just nuked my KMail configuration and rebuilt it from scratch. No idea 
how it got corrupted, but it apparently did.

Thanks to deloptes for his assistance, which didn't provide a direct answer 
but got me thinking in different directions.
-- 
dep

Sent with ProtonMail Secure Email. Because privacy matters.

Attachments:

• signature.asc (application/pgp-signature, 0.5kb)
• publickey - dep@drippingwithirony.com (application/pgp-key, 2.3kb)