DKIM_KEY_TOO_SHORT

warning

This DKIM key is shorter than 1024 bits. Some receivers already refuse keys this small.

Working today, and one change away from not working.

How we know

dkim.test
DKIM semantics as distinct from wire-level mangling: revoked (empty p=), a real 512-bit key, testing mode, wrong version, v= not first, unsupported algorithm, and a non-DKIM TXT sharing the selector. Every key is real and parses with node:crypto.