A delivery signed with RFC 9421 was counted under "other": its algorithm (rsa-v1_5-sha256) has an underscore, which a signature name could not hold. It is now counted as rfc9421:rsa-v1_5-sha256, as WordPress's are. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw